单词：droppings
droppings的用法和样例：
例句
- On the road there is little to protect them from mud, insects, and bird droppings.在路上,几乎没有东西去保护他们免遭泥土、昆虫和鸟粪的侵袭。
词汇搭配
- silkworm droppings蚕沙
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英文短篇故事（纽约）
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