be keen on

非常喜欢，热衷于

be in charge of, be in despair, be in drink, be in fashion, be in for, be in honour of sb.(sth.), be in love with, be in one's hands, be in sb.'s (sth.'s) honour, be in sympathy with, be in the habit of, be in the wrong, be incapable of, be inferior to, be innocent of..., be interested in, be involved in, be irrelevant to, be jealous of, be keen about, be known as, be known for, be known to, be likely to, be located in, be lost on, be loyal to, be made of, be made up of, be made up of..., be married to sb., be native to, be no match for, be noted as, be noted for, be occupied in, be off one's head, be on a diet, be on firm ground, be on hands and knees,