have it in one 有能力(做某事)
A:Harry was elected monitor at the class meeting yesterday.
B:Do you think he has it in him to be a good monitor?
A:He’s a good student as far as his achievement is concerned. But I really can’t tell whether he’ll make a good monitor.
A:昨天哈里在班会上被选为班长。
B:你认为他有能力成为一名好班长吗?
A:就他的成绩来说他是一名好学生。但他是不是能当个好班长,我也说不好。