trimethyl-derivative of xanthine, 1830, from German Kaffein, coined by chemist F.F. Runge (1795-1867), apparently from German Kaffee "coffee" (see coffee) + chemical suffix -ine (2) (German -in). The form of the English word may be via French caféine.
实用例句
1. As little as 50mg of caffeine can produce pharmacological effects.
仅仅50毫克的咖啡因就能产生药理效果。
来自柯林斯例句
2. The caffeine in coffee can jangle the nerves.
咖啡中的咖啡因会使神经紧张。
来自柯林斯例句
3. Caffeine can cause palpitations and headaches.
咖啡因会引起心悸和头痛。
来自柯林斯例句
4. As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.
凭经验估计，一杯过滤咖啡约含80毫克咖啡因。
来自柯林斯例句
5. The shaking inside may be due to low blood sugar, too much caffeine or too many cigarettes.
