The greatest concern the authors raise is space debris—pieces of "junk" that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.

作者提出的最大担忧是太空碎片，即环绕地球的“垃圾”碎片，如果它们与包括国际空间站在内的运行体相撞，将有可能造成严重损害。

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The greatest concern the authors raise is space debris-pieces of "junk" that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.

两位作者提出的最大担忧是太空垃圾——环绕地球运行的“垃圾”碎片，如果它们与包括国际空间站在内的运行单位相撞，可能会造成严重损害。

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Along with a loss of revenue, cancellations cause operational chaos.

随着收入损失，取消订单导致了操作上的问题。

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But the Trust's Juliet Lyon told BBC Wales that the overcrowding did, nevertheless, cause operational problems.

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In "every contributing cause where Halliburton is named, the operational responsibility lies solely with BP, " Halliburton said.

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Now efforts are made to develop operational integrated forecasting and warning systems, considering various hazards in coastal zones altogether that cause coastal inundation.

UNESCO: Communication and Information