例句
Doctors also warn us of nicotine, tar, and many other toxic substances contained in cigarettes.
医生也警告我们，香烟含有尼古丁、焦油以及许多其他有毒的物质。
Nicotinic acetylcholine receptors have many functions, and in the brain are the primary targets of nicotine.
尼古丁乙酰胆碱受体有许多作用，在大脑中，它是尼古丁的主要目标。