六级The greatest concern the authors raise is space debris一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空间碎片一环绕地球运行的“垃圾”碎片，如果与包括国际空间站在内的作战单位发生碰撞，可能造成严重损害。

2019年6月六级真题（第三套）阅读 Section B

四级To try to cut down its operational expenses.

努力降低运营费用。

2012年12月听力原文

六级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 IS Currently, there aren't many CubeSats and they're tracked closely.

作者提出的最令人担忧的是太空碎片——环绕地球运行的“垃圾”碎片，如果与包括is在内的作战单元相撞，可能会造成严重破坏

2019.6六级真题第三套

六级In addition to the inherent operational hazards of water scooters, they are proving to be an environmental nuisance.

除了水上滑板车固有的操作危险外，它们还被证明是一种环境公害。

2008年6月英语六级真题

考研Under modern conditions, this requires varying measures of centralized control and hence the help of specialized scientists such as economists and operational research experts.

在现代条件下，这需要不同的集中控制措施，因此需要经济学家和运筹学专家等专业科学家的帮助。

2000年全国硕士研究生入学统一考试英语试题