套子，指做成一定形状、套在外面的东西。见明 谢榛《四溟诗话》卷三：“学选诗不免乎套子，去套子则语新而句奇。”
她把套子罩在旧沙发上。
皮套子被套在了马蹄上，防止它们弄脏了跑马场。
Leather overshoes were put on the horses' hooves to stop them from marking the turf.
这些书就是一套子，左不过是些才子佳人，最没趣儿。
There is a sameness about all these tales. They're so stereotyped — all about talented scholars and lovely ladies.
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