If you ever find yourself buried in rubble¹ and can't get out, don't yell. You'll end up just wasting energy and losing your voice. What you should do is grab something and start tapping in intervals² of three. Humans are great at noticing patterns and the rescuers will start to move towards that. Once you hear them, then you can start yelling.

如果你发现自己被埋在瓦砾中出不来，不要大喊大叫。这样最终只会让你的精力耗尽，发不出声来。你应该做的是抓住某样东西，三次一间隔的开始敲击。人类非常善于发现有规律的声音，救援人员会开始朝着你的方向搜救。一旦你听到他们的声音，就可以大声呼救了。

 

If a tornado³ looks like it's not moving, that means it's heading towards you.

如果龙卷风看起来没有移动，那就意味着它正向你袭来。

 

A lot of backpacks have a hidden built-in whistle. The actual clip on many modern day backpacks that are meant for hiking or camping have that built-in whistle.

很多背包都带有一个隐藏的内置哨子。如今，不少远足或露营专用的双肩包的卡扣都有这种设计。

 

If you're ever at the beach and you see the water receding⁴ or far away from where it normally is, run. This normally means a tsunami⁵ is coming. And someone who paid attention in school in 2004 used this and saved their own life by getting out of there.

如果你在海滩上看到海水逐渐后退或远离平常的位置，快跑！这通常意味着海啸即将来临。2004年，在学校认真听讲的人凭借这个知识点逃脱，挽救了自己的生命。

 

If you ever see square waves in the water, get out immediately. These waves have powerful currents under the water that can sweep you out and take you away.

如果你在水中看到方波，立刻离开。这些波浪下隐藏着强大的水流，可以把你卷走。

 

If your car ever goes into water, open a window or door immediately. If you don't do this, the pressure differential is too great and it will keep everything shut and you have to wait until your car is completely filled with water in order to get out.

如果你的车进水了，应该立即打开车窗或车门。如果不这样做，巨大的压差会将门窗都关死。到那时你只能等到车里完全充满了水才能逃出来。

 

If you're somewhere and you don't have the right size battery, you can use a smaller battery and put aluminum⁶ foil in that extra space and it will still work. The aluminum foil will transfer the electricity and get the job done.

如果你在某个地方，没有合适尺寸的电池，可以使用更小号的电池，用铝箔填充空余的空间，这样也行得通。铝箔将传输电力并完成工作。

 

If someone falls in cold water and is close to hypothermia, don't put them next to a fire. They need to be warmed up slowly. Otherwise it could be potentially fatal and they could experience something called afterdrop. And this is due to the fact that your blood flow cannot adapt quick enough to that change from extreme cold to extreme hot.

如果有人落入冷水中，接近失温，不要把他们安置在火旁边。需要慢慢让他们热起来。否则可能带来致命后果，使他们在复温时核心体温进一步下降。这是因为血液流动没那么快，能够让身体很快地适应从极冷到极热的变化。

 

Before natural disasters make sure to fill your tub up and your sink with water that is clean. According to the FDA, after major disasters, water's either cut off or heavily contaminated. So it's important to make sure you have enough supply of clean water.

在自然灾害发生之前，一定要把你的浴缸和水槽装满干净的水。美国食品和药物管理局表示，在发生重大灾难后，水源要么被切断，要么被严重污染。所以确保你有充足的干净水很重要。

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