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1·A stray bullet struck his steel helmet and glanced off.

一颗流弹击中他的钢盔，又弹了开去。

2·You may swim well, but put on a flight suit, a survival vest, a helmet and steel-toed boots, and it's a whole different ballgame, Gayles says.

可能你泳游的挺好，可是穿着飞行服、救生背心，头戴钢盔，脚蹬铁头靴子，那就完全不是一码事了。