原始点医疗基金会:用by the time和before造两个完成时的句子

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?