1、expand

扩充;扩大;增加

Engineers noticed that the pipes were not expanding as expected.

工程师注意到管道并没有如预期那样膨胀。

The money supply expanded by 14.6 per cent in the year to September.

截至9月，当年的货币供应增加了14.6％。

扩大；发展；扩展

The popular ceramics industry expanded towards the middle of the 19th century.

到19世纪中期，大众制陶业得到了发展。

The interest rate's coming down. I'll be able to expand or stay in business.

利率正在降低，我可以扩大公司或者维持经营。

2、critical

极重要的;关键的

The incident happened at a critical point in the campaign.

该事件发生在竞选活动的关键时期。

Environmentalists say a critical factor in the city's pollution is its population.

环境保护主义者说造成该城市污染问题的一个关键因素是其人口数量。

(局势)严重的，有危险的

The German authorities are considering an airlift if the situation becomes critical.

如果局势变得危急，德国当局将考虑实施空运。

Its day-to-day finances are in a critical state.

其日常财务状况十分糟糕。