记忆方法
将“alertness”分解为“alert”（警觉的）和“-ness”（名词后缀，表示状态或品质），想象一个“alert”状态下的对象，比如一个亮着的红灯或警灯，不断提醒人们保持警觉，从而记住“alertness”表示的是警觉或机敏的状态。
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词族 · alertness
词形变化
派生词
英语词源
- alertness (n.)
- 1714, from alert + -ness.
权威例句
- 1. The drug improved mental alertness.
- 该药有助于提神。
- 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.
- 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.
- 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.
- 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.