开幕式活动

sporting activities───体育活动

optical activities───[光]旋光性

opening acts───开场白

opening times───营业时间(openingtime的复数)

overactivities───n.过于活泼，过度活跃；过度活性

physical activities───体育活动

bioactivities───n.生物活性；生物活度（指杀虫剂等对生物体的影响）

craft activities───工艺活动

negativities───n.否定性；消极性

The daily operations of today's businesses rely heavily on forms for data collection, including such activities as account opening, claims, requests for service, and even tax filing.───当今企业的日常运营在收集数据时严重依赖表格，包括设立账户、索赔、服务请求甚至纳税申请等活动都是如此。

If all such activities go underground, they would be more difficult to control," Lee says, potentially opening a greater market for trafficking.───Lee指出，如果所有活动都转入地下的话，监管会更加困难，而且还可能会滋生一个更大的人口贩卖市场。

Mostly this involves sitting outside waterside pubs watching narrowboats go by, occasionally helping (whether invited to or not) with lock-opening activities and the like.───多半时候，他要坐在水畔小酒馆的外面观察着运河小船的来来往往，偶尔为开锁之类的事情搭一把手（被请的或是不请自到的）。