a time of discovery是什么意思？

谢谢各位大虾给我解答啊。。我实在弄不明白。。

A GREAT DEAL OF TIME.... A great deal of time.... A Matter Of Time 歌词中文意思 Time has a way of taking time是什么意思? waste time和a waste of time的区别 为什么the time average of a time derivative vanisches? A ballet dancer must____for a long period of time before The advantage and disadvantage of doing a part-time job We lived in Beijing for a period of time. be taken a waste of time 是固定用法吗？