zài / yǒu / jī / huà / xué / kè / shàng / lǎo / shī / jiǎng / jiě / le / yǐ / suān / jī / de / jié / gòu在有机化学课上,老师讲解了乙酸基的结构。In organic chemistry class, the teacher explained the structure of the acetyl radical.