Army officers discovered that the wrist watch was most practical for active combat.

军官们发现，腕表在战斗中最实用。

youdao

Keeping the brain active and engaged appears to combat the cognitive decline associated with getting older.

保持大脑的灵活和集中看来要与随着年纪增大产生的认知降低做斗争。

youdao

Traps can only be placed when out of combat. Only one trap can be active at a time.

陷阱只能在非战斗时候放置，同一时间只能放置一个陷阱。

youdao

"Crossing the threshold to active combat was an important psychological moment, " Dr Stelzenmueller said.

BBC: German army prepares for new global role

In its legal submissions, the US justice department argues that because Afghanistan is an active combat zone it is not possible to conduct rigorous inquiries into individual cases and that it would divert precious military resources at a crucial time.

BBC: Ex-detainees allege Bagram abuse

"Belmokhtar likely wants to show he is still engaged in active operations and he is not moving away from the fighting - especially at a time when other Jihadists are in active combat against French troops in Mali, " he said.

CNN: STORY HIGHLIGHTS