During space adaptation, 50% to 75% of astronauts have highly unpleasant syndromes, such as vertigo, headaches, nausea, and overall tiredness.

50%至75%的宇航员在航天适应过程中都出现非常不舒服的症状，比如眩晕、头痛、恶心，和全身疲劳。

Good point – jet lag is the disruption of our circadian rhythms caused by high-speed travel across different time zones, which can cause tiredness and sleep problems.

没错，时差是由跨不同时区的高速飞行造成的昼夜节律紊，导致疲惫和睡眠问题。

Tiredness leaves your brain feeling foggy, slow and unproductive.

疲劳使你的大脑觉模糊，迟钝，没效率。

So, why not take a break between meetings and soak up some rays to combat the tiredness and jet lag?

既然如此，何不在议之间的空当偷个闲，吸收一点阳光，抵御疲劳与时差呢?

To present an opposing political idea, to suggest we wanted something different to eat, to be frank about our tiredness or anxiety, could threaten us with annihilation.

表达相反的政治观点，提议吃点不同的食物，坦诚我们的疲惫或焦虑，些行为都可能对我们造成歼灭性胁。

Millions of people around the world hit this wave of tiredness during the early afternoons every single day, which is actually a problem for me 'cause people who are tired tend not to watch YouTube for quite as long.

每一天，世界上千千万万的人都在下午一开始就累得不行，对我也是一种困扰，因为很疲劳的话也看不了多久的YouTube。

It was then he knew the depth of his tiredness.

时候他才明白自己疲乏到什么程度。

Many studies have shown that nature can calm us and make us feel happy. Nature, experts say, can also help us learn better. And experiencing nature helps people recover from the mental tiredness that comes from day-to-day work.

许多研究表明，大自然可以使我们平静，让我们到快乐。专家说，大自然也能帮助我们更好地学习。自然可以帮助人们从日常工作中产生的精神疲劳中恢复过来。

Caffeine gets in there and blocks that receptor so you never feel that tiredness.

咖啡因到脑区后 阻碍腺苷与体结合，所以你不到疲惫。

People who talk of tiredness do not know what the word really means.

说累的人们其实不理解个词的真实含义。

Too little salt can lead to muscle cramps, nausea and tiredness.

盐摄入不足可能导致肌肉痉挛、恶心和疲劳。

Tiredness, breathing problems, fast heart rate, and vomiting were the most common symptoms.

疲倦、呼吸困难、心率加快和呕吐是最常见的症状。

The French leader suffered headaches, a dry cough and tiredness for several days.

位法国领导人出现了头痛、咳嗽和疲倦等症状，些症状持续了数天时间。

So sometimes, for example, for lunch, I'd be like, you know what, I'm gonna have a banter, I'm gonna go for a burger and chips, and then I have this like brain fog and tiredness for the rest of the afternoon.

所以有时候，例如，午餐时，我说，你知道吗，我要开个玩笑，我要去吃汉堡和薯条，然后我下午剩下的时间里都到种脑雾和疲劳。

He also felt an odd, sick, empty feeling in his stomach that had nothing to do with tiredness and everything to do with the letter now curling blackly in the heart of the fire.

他还到内心有一种空落落的、不舒服的异样觉，觉跟疲劳没有关系，跟此刻在炉火里卷成黑色灰烬的那封信大有关系。

Studies have shown that melodic alarms, like those that play music, not only reduce perceived sleep inertia and tiredness in the morning, but actually improve psychomotor abilities and reduce attention issues compared to neutral alarms.

研究表明，与中性的闹铃相比，旋律闹钟（如播放音乐的闹钟）不仅能减少早晨的睡眠惰性和疲倦，还能提高精神运动能力，减少注意力问题。

Mild symptoms of cocaine withdrawal are mostly psychological: and include things like depression, anxiety, fatigue, reduced concentration, cravings, tiredness, increased appetite, excessive sleeping, and vivid dreaming due to increased time in REM sleep.

可卡因戒断的轻微症状大多是心理上的，包括抑郁、焦虑、疲劳和注意力减退、渴望、疲劳、食欲增加、嗜睡和由快速动眼期睡眠时间变长造成的多梦。

People who talk of tiredness do not know what the word really means, I did not know who I was or where I was going, and I did not care.

说累的人们其实不理解个词的真实含义。我不知道我是谁或我往哪儿去，我也不在乎。

Only minor side effects were reported in people taking part in the study, such as head and muscle aches, tiredness and pain at the injection site.

参与项研究的试者只报告了轻微的副作用，例如头痛和肌肉疼痛，注射部位疲劳和疼痛。

Oliver still had no idea of the purpose of this expedition, but his head ached with tiredness and he soon fell asleep.

到现在为止，奥利弗还不知道次远行的目的，可他累得头痛，马上就睡着了。