Alkylide
烃基化物
🗣️ 情景例句
and photograph street performances in the city,
拍摄城市 的街头表演，
The busiest men find (or have) the most leisure (or time).
最忙的人时间最多。
In his twenties Frank used to make spare parts for aeroplanes.
20多岁的时候，弗兰克曾生产飞机零配件。