对美国人而言，美国是世界上最强的超级大国，而且美国人民是一群单纯的朋友。
And for the Americans, the United States is the world's number one superpower, and the American people are a very simple people.
设计：整群抽样与单纯随机抽样。
DESIGN: a cluster sampling and simple randomized sampling survey.
我喜欢这群青年们单纯的信心和希望在这世界保持美好标准的渴望。
I like seeing the pure faith of these youth, and their hope and desire to keep the good standard in this world.
设S是一个右单纯、右可消的半群。
注射部位为上肢屈肌各肌群，也有单纯注射前臂肌群的。
The injection site was various muscle group of upper limb flexor muscle, also had the pure injection on forearm muscle group.
注射部位为上肢屈肌各肌群，也有单纯注射前臂肌群的。
The injection site was various muscle group of upper limb flexor muscle, also had the pure injection on forearm muscle group.
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