In part, this is because of the robust mechanics of turboprops and in part because Air Tractor's fuel tanks have rubber membranes which close around bullet holes to slow leaks.

在某种程度上，这是由于涡轮螺旋桨具有强健的力学特性，而部分原因是由于“空中拖拉机”的油箱有橡胶膜紧密围绕弹孔使得泄漏减缓。

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However, a latest research shows that the black holes might be close to the Earth, and even some mini black holes are passing through the Earth on a daily basis.

然而近期一项最新研究表明，黑洞可能接近地球，甚至每天都会有微型黑洞穿过地球轨道。

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In part this is because of the turboprops' robust design, and in part because Air Tractor's fuel tanks have rubber membranes which close around bullet holes to slow leaks.

其部分原因是涡轮螺旋桨飞机结构坚固，部分原因是“空中拖拉机”公司生产的油箱有多层橡胶密封，一旦子弹射穿油箱，橡胶层就会自动封闭住弹孔，减缓燃油的渗漏。

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The program researched vulnerabilities in computer networks running critical infrastructure and sought ways to close security holes.

WSJ: U.S. Program to Detect Cyber Attacks on Infrastructure

Cloud Computing appears to be another front in the effort to close tax loop holes that have seen many online retailers able charge little to no sales taxes.

FORBES: Massachusetts Proposes Taxing Cloud Computing Services

Oilsands Quest tried to explore close to the old Shell holes, says Edward Dancsok, a Saskatchewan government geological engineer.

FORBES: On The Cover/Top Stories