alertness是什么意思

实用例句

1. The drug improved mental alertness.

该药有助于提神。来自柯林斯例句

2. Alertness, calmness, courage : he could see them all in the youngster's face.

机警, 镇定, 胆量,都摆出在这年青人的脸上.来自子夜部分

3. We must maintain a military standard, an alertness, and never vary it.

我们必须保持军队的准则, 应当随时注意,切勿随时变动.来自辞典例句

4. The order urged the armed forces to enhance their alertness.

该项命令敦促武装部队提高警惕.来自辞典例句

5. Ginseng was reported to have increased energy and mental alertness.

人参可以增进体力和提高精神敏捷性.来自辞典例句