It took a long time for the effective use of natural gas to be made.
實(shí)現(xiàn)天然氣的有效使用花了很長時(shí)間.
原句可改為：To make the effective use of natural gas took a long time.
翻譯時(shí)要注意時(shí)態(tài)是過去時(shí).
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