The second input is a firmer pull on the upper wing, in this case with the left hand.
第二个输入动作是一个更加坚定果断的对上翼的拉，在这个例子中是用左手。
Outside market survey adopted questionnaire investigation, case study, deep interview and the study of second-hand materials etc.
外部市场调研主要采用问卷调查、文案研究、深入访谈和二手资料研究等方法；
In the case of jets, buying second-hand does not necessarily mean buying a used aircraft.
谈到喷气机，买二手货并不意味着买到的一定就是旧飞机。
In the case of jets, buying second-hand does not necessarily mean buying a used aircraft.
谈到喷气机，买二手货并不意味着买到的一定就是旧飞机。
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