Volunteer: a person who freely offers to take part in an enterprise or undertake a task.7 F& G- {/ l' g& `8 I
synonyms: subject, participant, case, patient; informalguinea pig2 R* h! a! I& e- Y- D
"each volunteer was tested three times" ! B& E% z3 r' g3 k1 P: ?! K, w* ?
这得强烈支持!3 t& t }9 B' w; u8 d% N1 e
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5 刀很好, 不多不少. * r1 Q( B; k) ^% Z1 z
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小时工最少11刀多. 何况是高才生上课.. i( v! ^$ C3 b' Y' I