求长难句解析：By commodity inspection,CIQ ensures that the quality of China's import and exportBy commodity inspection,CIQ ensures that the quality of China's import and export commodities shall meet the standards set forth in the contract,thu

求长难句解析：By commodity inspection,CIQ ensures that the quality of China's import and export
By commodity inspection,CIQ ensures that the quality of China's import and export commodities shall meet the standards set forth in the contract,thus protecting the national interests of China.实在是看不懂,shall 是用在什么句式中的?thus又是用在什么地方的?set forth in the contract又是什么.求整句话的详细解析（从语法,成分入手）,解释好可以多给些分.

By commodity inspection,CIQ ensures that the quality of China's import and export commodities shall meet the standards set forth in the contract,thus protecting the national interests of China.
我也看不懂.查词典咯~
By commodity inspection,通过商品检验
CIQ ensures that ,CIQ custom,immigration,quarantine,海关确保：
the quality 质量
of China's import and export commodities 中国进出口商品
shall meet the standards应符合标准
set forth陈述
in the contract合同中
,thus这样
protecting保护
the national interests国家利益
of China.中国
海关通过商品检验确保中国进出口商品的质量符合合同标准,从而保护中国的国家利益.

句子的结构应该是 The quality shall meet the standards.质量要符合标准。
By commodity inspection,CIQ ensures 商检和海关要确保质量符合标准。
China's import and export commodities 中国进出口商品。
set forth in the contract 标...

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句子的结构应该是 The quality shall meet the standards.质量要符合标准。
By commodity inspection,CIQ ensures 商检和海关要确保质量符合标准。
China's import and export commodities 中国进出口商品。
set forth in the contract 标准合同规定的
standards set forth in the contract 标准合同规定的标准
thus protecting the national interests of China 从而保护中国的国家利益 thus 引导的一个从句
最后翻译是：
由商检、海关确保中国进口和出口商品质量应当符合标准合同规定的标准,从而保护中国的国家利益

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