The high walls of the compound and the warm temperatures had caused the Black Hawk to descend inside its own rotor wash-a hazardous aerodynamic situation known as "settling with power."
庭院的高墙和较高的温度导致这架黑鹰在其自身的旋翼洗流中下坠。旋翼洗流是一种“具有动力的下坠”，这是种很危险的空气动力学状态。
The deadly BPA compound in these bottles is found to be extremely hazardous and already banned in some countries.
宝特瓶中所含的双酚a化合物具有毒性，在一些先进国家中已被列为禁用原料。
The deadly BPA compound in these bottles is found to be extremely hazardous and already banned in some countries.
宝特瓶中所含的双酚a化合物具有毒性，在一些先进国家中已被列为禁用原料。
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