Saferoute
安全疏散路线
🗣️ 情景例句
Yes. That would be much better.
行，那样也好。
I am on top of the world.
我高兴到了极点。
Once the oxygen content of the air had risen to 25% it was ready to burn.
一旦氧气在空气中的含量达到25%，它就要燃烧。