on the left is m97 in the constellation ursa major, also known in the northern hemisphere as the owl nebula.

1、

the best place to start is where my grandfather did, with the great bear (or ursa major).

最佳的起点正是我祖父的选择：大熊星座。

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2、

in the night sky, most noticeable are the stars of ursa major and the asterism known as the big dipper.

夜空中最有名的要数大熊座和北斗七星

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3、

probably the best known constellation , the stars of ursa major make up the great bear and the big dipper .

可能是最有名的星座，大熊座的星星组成了一个大熊和大勺。

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4、

increased dryness can be a combination of reduced oil production in your skin and environmental damage from washing or sun exposure.

你越来越干燥的皮肤可能是这两者的结合：你皮肤的油脂分泌变少和日晒雨淋的环境损害。

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5、

pre-stack reverse time migration of elastic wave equation

弹性波动方程叠前逆时偏移

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6、

zero-offset reverse time migration for prediction ahead of tunnel face

反射地震零偏移距逆时偏移方法用于隧道超前预报

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7、

an application of reverse-time migration in the ground-penetrating radar data processing

逆时偏移在探地雷达信号处理中的应用

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8、

reverse time migration of elastic wave and its imaging conditions

弹性波逆时偏移及其成像条件

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9、

terrain correction and migration of gpr profile fulfilled simultaneously using reverse-time migration

同时实现地质雷达数据地形校正和偏移成像的方法

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10、

in addition, the low-frequency noise caused by crosscorrelation imaging conditions also puzzles the practicality of reverse time migration.

而由互相关成像条件引入的低频噪声也是困扰逆时偏移实用化的一个问题。

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11、

this shows the importance of reverse-time migration in transversely isotropic media.

说明了横向各向同性介质逆时偏移方法的重要性。

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12、

prestack reverse time migration requires computing the first breaks time of imaging points.

叠前逆时偏移需要计算成像点的初至时间。

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13、

model test and calculation analysis on discharge of siphon spillway

虹吸溢洪道泄流量模型试验与计算分析

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14、

study on the hydraulic characteristics of siphon spillway

虹吸溢洪道水力特性试验研究

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15、

characteristic and calculation of pressure in siphon spillway

虹吸溢洪道压强特性分析和计算探讨

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16、

research of discharge characteristics and application condition of siphon spillway

虹吸溢洪道泄流特性及应用条件研究

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17、

quality control of rubber oil seal lip

橡胶油封唇口的质量控制

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18、

the way to enhance the seal function of rubber oil-seal and metal rotary axis in transmission

提高减速箱中橡胶油封-金属转轴密封性能的方法

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19、

study on carbon black-filled fluorosilicone rubber oil-seal formula

炭黑补强氟硅橡胶油封胶料的配方研究

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20、

the plastic colloid is easy to produce irregular distortion by the force emerged during the assembly process of the rubber oil seal.

橡胶油封在装配过程中，塑性胶体容易产生不规则变形，由于变形曲线无法准确描述，从而影响了进一步的受力分析。

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