Threeleaf
三叶
🗣️ 情景例句
a portrait of the United States--
一幅美国的剪影--
All produets have to go through five checks in the whole process.
所有产品在整个生产过程中得通过五道质量检查关。
The question was, which one?
问题是，哪一种气体导致火灾呢？