英語六級攻克閱讀關(guān)鍵句255. Alternative fuels such as natural gas, bu

255. Alternative fuels such as natural gas, burned in internal-combustion engines, could be introduced at relatively low cost, but they would lead to only marginal reductions in pollution and greenhouse emissions.

譯文　像天然氣這樣的可以在內(nèi)燃機里燃燒的替代燃料，能夠以相對較低的價格引入，但是它們也只能略微地減輕污染和減少溫室氣體的排放。

點睛　本句的主干是Alternative fuels...could be introduced..., but they would lead to only marginal reductions...。such as natural gas為插入語，是對fuels的解釋說明；burned in internal-combustion engines為過去分詞短語作定語，修飾fuels。

alternative意為“可選擇的；替代的”。如：

What alternative sources of goods and services are there? 有哪些可替代的商品和服務(wù)來源呢？

internal-combustion engine指“內(nèi)燃機”。relatively意為“相對地”。marginal意為“邊緣的；臨界的”。如：

For example, "marginal" areas must achieve attainment within three years. 比如說，“邊緣”地區(qū)必須在三年之內(nèi)達標(biāo)。

考點歸納　與lead相關(guān)的常用表達還有：

lead up to sth.意為“由一系列的步驟而導(dǎo)致”。如：

These circumstances will lead up to war. 這些事件會導(dǎo)致戰(zhàn)爭。

lead sb. by the nose 意為“牽著某人的鼻子走；完全控制某人”。如：

The manager always leads the clerk by the nose. 經(jīng)理總是牽著那個職員的鼻子走。

lead a dog's life 意為“（某人）過著痛苦不堪的生活”。如：

After the cruel war, he lead a dog's life. 戰(zhàn)后，他過著痛苦不堪的生活。

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