Pona number
[化] 波纳值
🧩 词语组成解析
abbr. paraffin; olefin; naphthene; aromatic (test for petroleum octane rating) 链烷烃
🗣️ 情景例句
His studies advanced steadily.
他的学业不断进步。
Whe angry, count ten before you speak; if very angry, a hundred.
怒时数十再说话，大怒数百方开言。
It was spring,but the weather was awful.It rained all the time.
是春天，但天气太糟了。一直在下雨。