If the petrol used in motor vehicles were lead-free, then it would be possible to filter exhaust fumes which are a major cause of pollution.
如果机动车使用的汽油是无铅的，那么，我们将有可能过滤掉那些引起污染的废气。
If the petrol used in motor vehicles were lead-free, then it would be possible to filter exhaust fumes which are a major cause of pollution.
如果机动车使用的汽油是无铅的，那么，我们将有可能过滤掉那些引起污染的废气。
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