be able to等于be able to=manage to 还等于什么

be able to 用法 be able to中文 able to be assigned be able to be able to (送分拉) 请问：be able to be able to 意思 be able to do sth 等于什么 be able to等于be able to=manage to 还等于什么 be able be able be able be able to 和will be able to 的区别 be able to open it be able to 的用法 be able to的用法 be able to的词性 can could be able to