1、expand

擴充;擴大;增加

Engineers noticed that the pipes were not expanding as expected.

工程師注意到管道并沒有如預期那樣膨脹。

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

截至9月，當年的貨幣供應增加了14.6％。

擴大；發展；擴展

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

到19世紀中期，大眾制陶業得到了發展。

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

利率正在降低，我可以擴大公司或者維持經營。

2、critical

極重要的;關鍵的

The incident happened at a critical point in the campaign.

該事件發生在競選活動的關鍵時期。

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

環境保護主義者說造成該城市污染問題的一個關鍵因素是其人口數量。

(局勢)嚴重的，有危險的

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

如果局勢變得危急，德國當局將考慮實施空運。

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

其日常財務狀況十分糟糕。