Rectigradation
直线渐变
🗣️ 情景例句
Relax, Harry.
不要紧张 ，Harry。
I leave the office at 7.
我七点离开办公室。
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。