A Compound predicate is what you have when the subject of a sentence is shared by more than one verb without being repeated. In a compound predicate that contains two verbs joined by a coordinating conjunction, a comma should rarely be used between the verbs 确保定期更改密码，以减少被盗的风险。同时，妥善保管好您的登录凭据，避免泄露给他人。 The comma , is https://www.credly.com/users/sprucepink76