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请用300字以内文字，主要从认证、机密性、完整性和抗抵赖性方面，论述李工的建议在安全上有哪些优点。

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The grammatical words which play so large a
part in English grammar are for the most part
sharply and obviously different from the lexical
words. A rough and ready difference which may
seem the most obvious is that grammatical words 【1】
have "less meaning", but in fact some grammarians 【2】
have called them "empty" words as opposed in the 【3】
"full" words of vocabulary. But this is a rather misled 【4】
way of expressing the distinction. Although a word like
the is not the name of something as man is, it is very
far away from being meaningless; there is a sharp 【5】
difference in meaning between "man is vile" and
"the man is vile", yet the is the single vehicle of this 【6】
difference in meaning. Moreover, grammatical words
differ considerably among themselves as the amount of 【7】
meaning they have even in the lexical sense. Another
name for the grammatical words has been "little
words". But size is by no mean a good criterion for 【8】
distinguishing the grammatical words of English,
when we consider that we have lexical words as 【9】
go, man, say, car. Apart from this, however,
there is a good deal of truth in what some people
say: we certainly do create a great number of 【10】
obscurity when we omit them. This is illustrated not
only in the poetry of Robert Browning but in the prose
of telegrams and newspaper headlines.
【M1】

图6—1为某房屋基础及断面图，请依据图示尺寸求出：
(1)砖砌基础工程量；
(2)混凝土垫层工程量。

The university will sand the applicant ______ kinds of material.

1. State the changes in the number of Chinese traveling abroad in the past three years.
2. Give possible reasons for the changes.