People sometimes travel by camel(改为一般疑问句）如题.

Sometimes people pollute the environment. Sometimes people pollute the environment. TRA是什么意思? G______ songs sometimes make people feel blue old people are sometimes very _.(forget) Sometimes some people have s______dreams at night. sometimes people pollution the enyironment什么意思? Sometimes people pollute the environment.划线提问 why do people sometimes feel empty? 线性代数中trA是什么意思 i tra to 线性代数中trA是什么意思~~ Sometimes Sometimes Sometimes,people cry for enduring too long rather 中文翻译意思 people sometimes change and forget to tell each othershenmeyisi sometimes what people say hiaes their real meaning sometimes what people say hides their real meaning