在国际组织雇员和荷兰商业飞行员中的两项回顾性队列研究，以调查与航空旅行有关的静脉血栓栓塞的实际风险；以及。

Two retrospective cohort studies among employees of international organizations and Dutch commercial pilots to investigate the actual risk of VTE related to air travel; and.

youdao

他详细记录了每次航空和火车的旅途过程，每一次他都会让司机或者飞行员签名以证明他的旅行。

He has kept a detailed log of every flight and train journey he has taken, which he had counter-signed by each driver and pilot to verify his achievement.

youdao

so I am part of this hiking group here.

所以我是徒步旅行小组的一员。

想加入社团 - SpeakingMax英语口语达人