abide the rule 还是 abide by the rule?

If you join the army, you have to abide its rules.

If you join the army, you have to abide by its rules.

(如果你从军，就必须遵守其规定。)

答案：If you join the army, you have to abide by its rules.

abide sth 用于否定句时，表“不能忍受某物”，如: I can't abide those rules. (我无法忍受那些规定。) abide by sth 指“遵守规定、规则等”。