Vaild
[法] 有效的, 经过正当手续的, 正当的
🗣️ 情景例句
Your car's very noisy. The muffler must be damaged.
你的车噪音真大，消声器一定出毛病了。
So he keeps on studying after his English classes in order to prepare for life in America.
所以他在英语课下课后还继续学习，为以后在美国生活做准备。
He did not know from which part of Africa his ancestor had come.
他不知道祖先来自非洲的什么地方。