每日英译中，来自每日翻译

· 英译中

原文：

It's cold and flu season. That means you're very likely surrounded by a symphony of coughs and sniffling noses — if you're not actively coughing yourself.

And whether your main complaint is a cough, a fever, a headache or a runny or stuffy nose, you may notice that you tend to feel worse at night.

That's not your imagination. Several factors are to blame, starting with your circadian rhythm, which is your body's internal clock. When the sun sets, it tells your brain to wind down for bed and, at the same time, spurs certain immune cells to become more active. Every night, those cells are recruited to different parts of your body, on the lookout for invading pathogens like viruses and bacteria.

译文：

又到了伤风感冒的季节。就算你没咳嗽，周围也少不了此起彼伏的咳嗽声和抽鼻子的声音。

不管你是咳嗽、发烧、头痛，还是流鼻涕或鼻塞，你可能注意到，一到晚上症状就会加重。

这可不是扑风捉影。有几个因素是罪魁祸首，首先是你的昼夜节律，也就是你的生物钟。太阳落山时，大脑会接收到要睡觉休息了，同时刺激某些免疫细胞使用之更活跃。每天晚上，这些细胞都会送向不同的身体部位，寻找病毒和细菌等入侵的病原体。