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1、carry out
实施；执行；实行
The Social Democrats could still carry out their threat to leave the government.
社会民主党人仍有可能将其退出政府的威胁付诸实施。
Police say they believe the attacks were carried out by nationalists.
警方说,他们认为袭击是民族主义分子发动的。
2、collaboration
(尤指在著书或研究方面的)合作，协作
There is substantial collaboration with neighbouring departments.
与相邻的一些部门有大量的合作。
Close collaboration between the Bank and the Fund is not merely desirable, it is essential.
银行与基金会的紧密合作不仅可取，而且必不可少。
合作(或协作)的成果
He was also a writer of beautiful stories, some of which are collaborations with his fiancee.
他还写了一些美妙的故事，其中有些是和他的未婚妻合著的。
3、operation
（由大量人员参与、具有高度组织性的）活动，行动，工作
The rescue operation began on Friday afternoon.
救援行动于星期五下午开始。
The soldiers were engaged in a military operation close to the Ugandan border.
这些士兵参加了乌干达边境附近的一次军事行动。
使用；运作
Until the rail links are in operation, passengers can only travel through the tunnel by coach.
在铁路连线开通之前，乘客只能乘坐长途客车穿越隧道。
the free banking system that has been in operation since the early eighties.
从80年代初就开始实行的自由银行制度
