He started running and soon broke a sweat.他开始跑步，很快就冒汗了。

He loaded all five boxes without breaking a sweat.他把五只箱子全装上了，一点没出汗。

He gave a perfect performance and didn't break a sweat.他轻而易举地进行了完美的表演。

She rattled off the answers without breaking a sweat. [=she gave the answers very easily]她毫不费劲，随口就把答案说出来了。