This is not because they had a great breeding season here – they didn't – but because a multitude has come over here from Scandinavia, where an even lousier spring produced even less for them. 这并不是因为它们在这里有一个重要的繁殖季他们没有而是因为许多是从斯堪的纳维亚半岛来到这里,那里差劲的春天给他们生产更少。
Unfortunately, the clearer you put the story the lousier it comes out. 不幸的是,你写得越清楚,结果就越糟糕。