Ultrafine
a. 极其细小的, 非常细微的
🗣️ 情景例句
Fortunately, I found his house at once.
很幸运地，我立刻找到他家。
Mr. Jones is a renowned international authority on the problem of overpopulation in developing countries.
琼斯先生在发展中国家人口过剩问题方面是声誉卓著的国际权威。
The children started to walk around the island.
孩子们开始绕着小岛散步。