Volunteer: a person who freely offers to take part in an enterprise or undertake a task. R. Z' I( r/ {) X2 b
synonyms: subject, participant, case, patient; informalguinea pig, h0 `/ }! L4 e
"each volunteer was tested three times"4 k! D' c' Q2 D- \3 j, H
这得强烈支持! 9 p, Z R6 m) W& g- N' R B, I& v |- S4 Z, l { X
5 刀很好, 不多不少. : Z! l' U0 x6 N * x) m1 p2 r s% n1 ]# \7 k小时工最少11刀多. 何况是高才生上课.+ X9 A) K, t6 C! q4 w5 i$ k+ s/ [