Pentylene
戊二 烯
🗣️ 情景例句
I know.
我知道。
To be of use in the world is the only way to be happy.
为善最乐。
After it had passed, they swam on as quickly as they could because they knew that the boat would soon return.
快艇过去之后，他们以最快的速度向前游去，因为他们知道快艇马上就要转回来。