1. I found his style of lecturing rather soporific. 我感到他的讲课方式令人昏昏欲睡。
2. The soporific is ready! What a nasty smell! I can fill the washbowl now. 安眠药准备好了！多难闻的气味！我可以把它放在脸盆里。
3. To have any soporific effect, tryptophan has to cross the blood-brain barrier. And in the presence of other amino acids, it ends up fighting — largely unsuccessfully — to move across. 要达到任何助眠效果，色氨酸必须要通过所谓血脑障壁，而且在其他胺基酸的存在下，要竞争才能进大脑，大部分都失败无法进入。
英英解释
n.
1. a drug that induces sleep
2. sleep inducing
3. inducing mental lethargy
