这药已证实是有效的。

It has been demonstrated that this drug is effective.

幽默是比暴力更有效的防御武器。

Humour is a more effective defence than violence.

这是另外一些与航空有关网页的有效链接。

Here are some live links to other aviation-related web pages.

她迅速有效地处理全部来往信件。

She deals with all the correspondence promptly and efficiently.

这个特价优惠月底前有效。

This special offer is valid until the end of the month.

试试这种乳霜吧——对皮肤斑点挺有效。

Try this cream ─ it's great for spots.

本协议的有效期已过。

The period of validity of the agreement has expired.

那旅馆的服务工作有效率而不夸张。

The service at the hotel is efficient and unobtrusive.

此签证有效期为14天，可延期到一个月。

The visa is for 14 days, extendable to one month.

新税种的有效施行期限为五年。

There is a five-year sunset on the new tax.

这酸奶的有效期到11月20日。

The expiration date on this yogurt was November 20.

反对党的声音被有效地压制了下去。

The voices of the opposition were effectively smothered.