词素是最小的辨别语法单元，也是语法层次中最低级的单元。
A morpheme is the minimal distinctive grammatical unit, and is the lowest unit grammatical hierarchy.
这户人家推崇的是彬彬有礼、效率和节俭(当然是高出语法层次上的！)
This is a household in which politeness, effort and frugality are valued (certainly above grammar!)
然而，这种方法还局限在字、词、句和语法层次上，极少涉及语篇层次。
However, most of these methods aim only at writing on the levels of words, phrases, sentences and grammar, and seldom treat writing at the discourse level.
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