Two white-helmeted officers gunned their engines into life.
两名戴着白色头盔的军官一下子把发动机发动起来。
To make it worse, there were no police to keep them in check. Not one blue-helmeted officer in sight.
更糟糕的是，没有警察维持秩序，也看不到有戴着蓝头盔的官员。
Agent Chet Blackburn, the assault team leader, stuck his helmeted head into the cab. "Maybe we should have used an assault chopper."
突击队队长切特·布莱克本特工戴着防弹盔的脑袋挤进了驾驶室：“也许我们应该用突击直升机。”
Rolls of coiled steel sat near the end of a long assembly line as a few helmeted workers lounged about, playing with their mobile phones.
一卷卷的成卷带钢放置在长长的装配线尾端，一些戴着安全帽的个人在闲晃，玩着手机。
Biologists at Northeastern University have peered directly at running muscles by measuring blood flow in the legs of the helmeted guinea fowl Numida meleagris.
而美国东北大学的生物学家则是直接观察「盔珠鸡」的肌肉，测量跑步时血液在腿中流动的情形。
Biologists at Northeastern University have peered directly at running muscles by measuring blood flow in the legs of the helmeted guinea fowl Numida meleagris.
而美国东北大学的生物学家则是直接观察「盔珠鸡」的肌肉，测量跑步时血液在腿中流动的情形。
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