Gedy
地球動力測量衛(wèi)星
??? 情景例句
Is everything OK?
一切都好嗎？
There is nothing which has not been bitter before being ripe.
事情在成功前沒有不艱苦的。
Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.
反之，如果恒星很小，維持生命的行星就要在離恒星很近的軌道上運(yùn)行，而且要有極好的條件才能使生命得以發(fā)展，