I can't take a bite without calculating how many calories I am taking.

　　重点

　　take a bite的字面意思是“咬一口”，它的另一层意思是“尝试一下”，相当于have a try。例句里是第一个意思。

　　考点归纳

　　与bite相关的常见用法还有：

　　bite me，该短语可以单独成句，意为Leave me alone! (别理我!)或Go away! (走开!)

　　What's biting you?意思与What's wrong with you?相当，表示“你出什么事了?”“你为什么事烦恼呀?”

　　bite the dust意为to be killed in battle(在战争中倒下，战死)。如：

　　It was such a serious battle that all the soldiers bit the dust. 战斗进行得异常激烈，战士们全部阵亡。