be lacking in,lack词性?

be lacking in,lack词性? be lacking in 和 lack for区别 be lacking in 是什么词性 举例说明 lack相关短语的区别,be lack of,be lacking in ,lack sth,a lack of sth lack的用法请问a lack of、be lacking in和lack for用法上有什么区别? to lack in 怎么用啊 和 be lacking in 什么区别 英语中Lack的用法请问lack,a lack of,be lacking in这3个词有什么区别.我知道lack可以做 lack 的用法a lack of、be lacking in和lack for用法上有什么区别吗?尤其是lack of 请问lack,lack for,be lacking for有什么区别? be lacking in life 关于短语be lacking in lack of,lacking of