The policeman congratulated the assistant on her quick work. 警察称赞那位助理员办事迅速。
While chimpanzees nested in trees at night, a field assistant below them caught urine in a plastic bag held between a forked twig. 当晚上黑猩猩栖居于树上的时候，一个农林助理员通过在一个叉形的树杈上固定塑料袋的形式来收集黑猩猩的尿液。
