Nonorientable
不可定向的
🗣️ 情景例句
At what time?
几点？
Our first bill came yesterday, and we have some questions.
我们昨天收到的第一张帐单，有一些问题。
he identifies himself with its centre of gravity, its mass, its weight;
他把自身和物体重心、质量、重量融为一体。