讲解文本：
no joke 不是闹着玩的，不容易的事，并非儿戏 It was no joke carrying those heavy bags. 搬那些重袋子可不是件轻松的事。 It's no joke catching a cold when you are recovering from an injury. 你正在养伤，受了寒可不是玩儿的！
疯狂练习吧！
