He's seen many changes in the course of his long life.
他在漫长的一生中目睹了许许多多的变化。
Grandfather has seen many changes in the course of his long life.
祖父在其漫长的一生中目睹了许许多多的变化。
Of course, if we give too little care to maintain our body, it is impossible to keep long life.
当然，如果我们不注意保养身体，是很难长命百岁的。
He has seen many changes in the course of his long life.
他在漫长的一生中目睹了许许多多的变化。
He has seen many changes in the course of his long life.
他在漫长的一生中目睹了许许多多的变化。
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