OK, and so this is the notion of acceleration that's relevant to physics when you find F= ma; that's the that you have in mind here. It's a vector.

This is the Second Law by Newton perhaps the most important law in all of physics F= ma but certainly in all of801: F equals ma.

这即为牛顿第二定律，物理学中十分重要的定律，本课程最重要的定律。

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F= ma mdv/ dt I can also write with this m dv/ dt.

所以，，F，=，ma，，so，therefore，也可以写成。

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The next equation that I have is an obvious one, f= MA that is Newton's second law: f= MA.

那是很明显的等式，牛顿第二定律。

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Since F= ma, various body parts would accelerate slightly.

由于力等于质量乘以加速度，因而许多身体部位都会产生很小的加速度。

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As for the slaves, escape meant a journey of hundreds of miles through unknown country, where they were usually easy to recognize.

至于那些黑奴，逃亡意味着数百英里的长途跋涉，意味着穿越自己极易被人辨认的陌生地域。

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The pancreatic ducts, arteries and veins, lymphatic vessels and nerve fiber bundle were easily recognized and demarcated.

穿行于小叶间结缔组织内的胰腺导管、动脉和静脉血管、淋巴管以及神经纤维束，易被辨认和区别。

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With the growth of fetus from 17 to 23 weeks, ducts mainly differentiated into interlobular and striated ducts as their number increased, but it wasn'teasy to identify intercalated ducts;

17～23周时，随着胎儿发育，导管数量增多并主要分化出小叶间导管和纹状管，闰管不易辨认；

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They're known for their devotion to comics and computer games and can easily be identified by their standard outfit of track suit, knapsack and spectacles.

“御宅族”以迷恋漫画和电子游戏而著称，他们的标准行头是竞赛服、旅行背包和墨镜，所以极易辨认。

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Marmite is made from yeast extract, a by-product of beer brewing, and is a sticky, dark brown paste with a distinctive, powerful flavour.

马麦酱是用酵母提取物制成。酵母提取物是啤酒发酵的副产品，性状粘稠，颜色较深，味道浓郁易辨认。

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Total fundus DR, posterior pole DR, and mid-peripheral DR were easy to be recognized clinically, but the diagnosis of peripheral type was easily missed.

全眼底型、后极部型和中周部型的病变在临床上较易辨认，而周而边部病变容易漏诊。

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Each piece of black face about big spot, this is most easily recognizable features of sparrows, one of two white feather shoulder belt.

脸颊部左右各一块黑色大斑，这是麻雀最易辨认的特征之一，肩羽有两条白色的带状纹。

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The transverse tubule system of ventricular muscles of the domestic pigeon was most easily recognized, which was rarely seen in the other animals.

横小管系统以家鸽心室肌最易辨认，其它均少见。

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Results The common characteristics of the potentials were good frequency response, easy identification and lower responsive thresholds.

结果：两种电位的共同特点是频率响应好，波形稳定，易辨认。

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By creating a distinctive style, you give your site and your company a concrete, recognizable image.

通过创建与众不同的形式，网站与企业的形象更具体、更易辨认。

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As a result, both the outer circular muscle and inner longitudinal muscle were difficult to recognize.

体被下层中外环肌和内纵肌不易辨认。

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They arranged radially from optic disc to peripheral of retina and became gradually looser and thinner.

它们自视神经盘处向视网膜周边都呈放射状走行，在向周围行进过程中突起来逐渐变稀变细，至视网膜周边部突起来已模糊不易辨认。

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Retinal nerve fibre layer could not be distinguished in 9 eyes ( 23.68%).

9眼（23.68%）不易辨认视神经纤维层。

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It has been verified after testing 36 patients ( male 22 and female 14) that this method is practical and easy to use, especially for stopping paroxysmal supraventri-cular tachycardia and for setting position of catheter electrode when the P wave can not be distinguished.

经36例食管调搏验证，此方法简易实用，尤其适用于终止阵发性室上性心动过速、P波不易辨认时导管电极的定位。

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By analyzing interaction of point electric charge and electric current, in the deduction process of Newton's third law, the paper discusses the preconditions of Newton's third law in electromagnetism.

通过对点电荷及电流的相互作用进行分析，根据Newton第三定律的推导过程，得出Newton第三定律在电磁学中成立的条件。

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Newton's Third Law is at stake.

第三定律岌岌可危。

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