A narcotic alkaloid, C18H 21no 4, related to codeine, used as an analgesic and a sedative chiefly in the form of its hydrochloride salt.(一种麻醉性的生物碱，C18H21NO4，和可待因有关的，用作止育药和镇静药，主要以其盐酸化物盐的形式存在。)
They use opium as a sedative, rather than as a narcotic.(他们把鸦片作为镇静剂，而不是作为麻醉剂。)
He took a narcotic drink.(他喝了带麻药的饮料。)
Crabs are unable to process magnesium in their blood below a certain temperature, and the result is a narcotic effect on the crabs' movement.(蟹类无法在低于某一温度的情况下在血液中产生镁，镁的缺乏会导致蟹类的动作出现麻痹反应。)
This is a narcotic substance.(这是一种麻醉品。)
That includes $1.8 billion with DynCorp International for police and special anti-narcotic training.(这其中包括与戴恩国际签订的用于警察和特种缉毒训练的18亿美元。)
A certain amount of dreaming is good, like a narcotic in discreet doses.(一定程度的梦想，正如适量的镇静剂，是好的。)
The mountains of Yemen are covered in green terraces growing qat, a mildly narcotic plant that takes up more than half the country's arable land.(也门的山脉被种植咔特的绿色梯田覆盖着，咔特这种有轻微麻醉效果的植物占了整个国家大半的耕地。)
One evening, like a cup of Reserva, and its purpose, my heart to think of narcotic.(一个黄昏，恰似一杯陈酒，它的目的，想着麻醉我的心。)
In small quantities, these ions are needed for energy metabolism. Too many, though, act as a narcotic that eventually kills the animal.(它们需要少量镁离子进行能量代谢，而镁离子太多的话也会作为一种麻醉剂，最后使它们死翘翘。)
