He sat back, smiling complacently at his own cleverness.他身体后仰靠在椅背上, 为自己的机智得意地笑着。

We cannot sit back complacently until retirement, secure that there will be enough money for us in our old age.我们在退休前不能掉以轻心, 要确保我们年迈时有足够的钱。

The Republicans complacently assumed that Clinton's endless humiliations would result in landslides for them.共和党想满以为让克林顿颜面扫地的事没完没了, 自己会大获全胜。