如今奥巴马必须“维护美国经过千辛万苦才获得的成就。”

Obama must now "safeguard an American accomplishment that has been too hard won.

youdao

我经过输送、过滤、净化，从江河之中千辛万苦来到这里，请您珍惜。——请节约用水！

I travel here through pipes, filtrate and purify to reach you, so please cherish me.

youdao

毛毛虫变成蝴蝶，经过了千辛万苦的蜕变，如果它一旦放弃，那将功亏一篑。

Caterpillar becomes a butterfly, after a lot of hard work of transformation, if it once abandoned, it would fall short.

youdao