Tetrads
四色相(等间隔)配色
🗣️ 情景例句
On a studect visa, full-time work is not permitted.
持学生签证的话，不允许做全职工作。
I know he will be able to find way home.
我知道他会找到回家的路。
It's been open for several years.
它建成已有好几年了。