If you shine a bright light in your face before bed you're telling your body it's time to perk up and be alert.

如果在睡前你还把脸放到强光底下，那就等于告诉你的身体是时候起来干活了。

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Monkeys of this species have mild character, petite body; are restless in personality and alert and have a maximum body length only 20 centimeters.

这种品种的猴子性格温和、体型娇小，个性好动而机警，体长最长只有20厘米左右。

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Because of their texture, temperature, and consistency, they taste sweet, and alert your body to stop eating before you \ 've overdone it.

它们吃起来有口感，香甜，冰凉，而且在你进食过度之前，它会提醒你停止进食。与一个12盎司的蓝莓味雪糕与相比，你可以节省80卡路里。

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This technology, alert to body as well as brain, wants to respond to our behavior, not change it.

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Parasites developing in the lymph nodes might alert the body that an invader is present, and activate a protective immune response.

BBC: The malaria parasite is spread by mosquitoes

The team, from the National Cancer Institute near Washington DC, say they were able to effectively prime the "sentry cells" which alert the body to foreign attack.

BBC: 'Supercharged' immune system takes on cancer