what
pron.(用以询问某人或某事物的词)什么,多少; …的事物;
adj.…的(事物或人);
adv.(用于感叹句中);
int.(用以表示不相信或惊奇); (用以表示未听清楚对方说的话);
What time did you get here?
你什么时候到达这儿的?
I don't know what you're on about.
我不懂你在谈什么。
What in the world did they think they were doing?
他们到底认为自己在做什么?