Make sure check the bolt and nut before testing run. and if they become less crowded, fastening again.
试车前务必检查所有螺栓、螺母是否有松动，若有松动的螺栓、螺母必须重新紧固。
They say the world will become more crowded, Therefore, we will have even more environmental problems and live in a world with less energy available.
他们说世界将会变得更拥挤，因此，我们将有更多的环境问题，生活在这样一个世界能够使用更少的能量。
Such pandemics will become more frequent as ecosystems become more crowded, less varied and more fragile.
随着生态系统更为拥挤，物种减少并变得更脆弱，大流行病会愈加平凡，随时爆发。
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