短语词组用作动词 (v.)～+副词strap firmly 系紧安全带strap on 绑住strap on a wristwatch 带上手表strap up 用带子捆紧strap up a suitcase 束住手提皮箱strap up one 's wound 包扎伤口～+介词strap a bag onto one 's back 用带子将包捆在背上短语 返回 straps