要不然

我对这个政府的印象是，他们需要强一点儿的经济政策，要不然将来会遇到很大的问题。

我對這個政府的印象是，他們需要強一點兒的經濟政策，要不然將來會遇到很大的問題。

My impression of this government is that they need a more forceful economic policy, otherwise they'll encounter large problems in the future.

今天天气很冷，您多穿衣服吧，要不然会感冒的。

今天天氣很冷，您多穿衣服吧，要不然會感冒的。

It's really cold today. You should dress warmer or you might catch a cold.

我該走了，要不然我會遲到的。

I have to go, otherwise I'll arrive late.

別把菸頭往地上扔，要不然蟑螂會得癌症的。

Don't throw cigarette butts on the ground. Cockroaches might get cancer.