Without her his life was meaningless; yet live he must, and for her sake.

没有她生命就没有意义，但是为了她，他必须活下去。

youdao

And for the sake of simple, we considered a 2d model without gravity.

为简单起见，本文主要考虑的是一个二维无重力模型。

youdao

And for the sake of simple, we considered a 2d model without gravity.

为简单起见，本文主要考虑的是一个二维无重力模型。

youdao