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    七、An advantage of ~~~ is that + 句子 (...的優(yōu)點(diǎn)是...)
    例句：An advantage of using the solar energy is that it won't create (produce) any pollution.
    用太陽(yáng)能的優(yōu)點(diǎn)是它不會(huì)制造任何污染。
    八、The reason why + 句子 ~~~ is that + 句子 (...的原因是...)
    例句：The reason why we have to grow trees is that they can provide us with fresh air./ The reason why we have to grow trees is that they can supply fresh air for us.
    我們必須種樹(shù)的原因是它們能供應(yīng)我們新鮮的空氣。
    九、So + 形容詞 + be + 主詞 + that + 句子 (如此...以致于...)
    例句：So precious is time that we can't afford to waste it.
    時(shí)間是如此珍貴，我們經(jīng)不起浪費(fèi)它。