Point number
[计] 数据标记序号
🧩 词语组成解析
🗣️ 情景例句
The signs of the city never fail to impress the foreign tourists.
外国游客无一不对该城市留有深刻的印象。
What we do willingly is easy.
世上无难事，只要肯登攀。
It is fairly clear that sleeping period must have some function,
很清楚，睡眠必然具有某种作用。