怪物猎人2捕虫网g:用by the time和before造两个完成时的句子

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He had left Chine by the time when he was 40 years old.
He had left Chine before he was 40 years old

By the time I got outside, the bus had already left
i've never met you before

用by the time和before造两个完成时的句子 by the time是什么意思？ "the time before time"什么意思 The design liaison meeting_____ten days by the time it ends. Before the arrivel of the White ,Austrialia was inhabited solely by Aborigines. By the time i was seven ,i had by the time表示什么时间有什么用法讲究？ i want to retire by the time i am thirty at any time by the wretten consent of both parties what's the time by your watch?什么意思?