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1·The tef snatched at the girl's purse.

小偷抢夺那个女孩的钱包。

2·WHO-TEF values have been established which apply to humans, mammals, birds and fish.

世卫组织毒性当量因子值已经得到确立，适用于人类、哺乳动物、鸟类和鱼类。

3·Objective To evaluate the diagnostic value of helical ct in congenital esophageal atresia and tracheoesophageal fistula (CEA-TEF).

目的探讨螺旋CT对先天性食管闭锁并气管食管瘘的诊断价值。