We could have done better under more favourable conditions.
如果在更好的条件下，我们会干得更好。
The students would not have made so much progress under less favourable conditions.
如果不是条件有利，那么同学们不可能取得如此多的进步。
The students would not have made so much progress under less favourable conditions.
如果不是条件有利，那么同学们不可能取得如此多的进步。
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