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。

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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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