Dihydroxy cyclobutenedione
[化] 方形酸; 二羟基环丁烯二酮
🗣️ 情景例句
It's five years ago.
那是五年前了。
Don't forget to phone to let us know you arrived safely.
不要忘记打电话，告诉我们你已经安全抵达。
Neither can I.
我也不能。