once every three or four years, when conditions are right, the lake is covered with the pink birds as they stop flight to breed.

1、

他们饲养牲畜以供应市场。

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2、

randomized, there are placebo-controlled, double-blind, multi-center clinical trials to prove efficacy is a reliable method.

随机分组、有安慰剂对照、双盲、多中心的临床试验，才是证明疗效的可靠方法。

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3、

the new therapy was tested in placebo-controlled clinical trials and improved alzheimer patients'memory, ability to do everyday things and overall functioning.

安慰剂对照临床试验结果表明，阿尔茨海默病患者的记忆力、处理日常事务能力及整体功能改善，验证了这一新疗法。

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4、

a randomized, placebo-controlled trial of natalizumab for relapsing multiple sclerosis

一项那他珠单抗治疗复发型多发性硬化症的随机、安慰剂对照试验

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5、

researchers conducted a randomized, double-blind, placebo-controlled study of 40 postmenopausal women ages 45 to 65 with high blood pressure.

研究者对40位45岁至65岁的绝经后高血压妇女进行了一项随机、双盲、安慰剂对照的研究。

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6、

double-blind and randomized placebo-controlled trial of cerebrolysin in improvement of nerve function and living ability in patients with ischemic stroke

Cerebrolysin改善缺血性脑卒中患者神经功能和生活能力的随机双盲研究

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7、

double-blind placebo-controlled study of autologous transplanted epidermal cell suspensions for repigmenting vitiligo

自体表皮细胞悬液移植治疗白癜风的双盲安慰剂对照研究

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8、

randomized placebo-controlled trial of early aspirin use in 20 000 patients with acute ischaemic stroke ( cast clinical trial)

全国2万例急性缺血性脑卒中早期抗血小板治疗临床对照研究结果（CAST临床试验）

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9、

randomized placebo-controlled study of the nicotinic agonist sib-1508y in parkinson disease

烟碱激动剂SIB-1508Y治疗帕金森病的随机安慰剂对照研究

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10、

we conducted a double-blind, randomized, placebo-controlled trial of sildenafil in two periods.

我们进行了一个随机双盲空白对照试验，该试验分为两个阶段进行。

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11、

urinary trypsin inhibitor in sirs and mods of critically ill surgical patients: a placebo-controlled study

蛋白酶抑制剂对外科高危病人SIRS与MODS作用的研究

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12、

oxymatrine in the treatment of chronic hepatitis b for one year: a multicenter random double-blind placebo-controlled trial

氧化苦参碱治疗慢性乙型肝炎的随机双盲对照多中心研究

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13、

double-blind, placebo-controlled study of lamotrigine in primary generalized tonic-clonic seizures

研究拉莫三嗪在原发性泛发性强直-阵挛发作中的作用

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14、

theophylline in the treatment of chronic obstructive pulmonary disease: a randomized, double-blind, placebo-controlled study

茶碱治疗慢性阻塞性肺疾病的随机双盲平行对照研究

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15、

in such situations, conventional double-blind, placebo-controlled clinical trials might not always be necessary or appropriate.

在这种情况下，并不总是需要也并不总是合适采用传统的双盲疗法和安慰疗法。

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16、

naltrexone for alcohol dependence: a double blind placebo-controlled trial

纳曲酮治疗酒依赖患者的安慰剂双盲对照研究

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17、

this study now demonstrates such an effect for a selective cox-2 inhibitor in a placebo-controlled randomized study.

现在的这项研究证实了在安慰剂作为对照的随机实验中，一种选择性COX-2抑制剂也有这种效应。

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18、

there are no randomized, placebo-controlled trials of placenta consumption.

关于食用胎盘，尚无随机、安慰剂对照试验。

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19、

oral zinc sulfate in the treatment of rosacea: a double blind, placebo-controlled study

口服硫酸锌治疗酒渣鼻：一项双盲、安慰剂对照研究

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20、

the study design was a randomised, double-blind, placebo-controlled prospective trial.

该研究采取随机双盲及安慰剂对照前瞻性试验。

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