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.
雙語例句
1. As little as 50mg of caffeine can produce pharmacological effects.
僅僅50毫克的咖啡因就能產生藥理效果。
來自柯林斯例句
2. The caffeine in coffee can jangle the nerves.
咖啡中的咖啡因會使神經緊張。
來自柯林斯例句
3. Caffeine can cause palpitations and headaches.
咖啡因會引起心悸和頭痛。
來自柯林斯例句
4. As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.
憑經驗估計，一杯過濾咖啡約含80毫克咖啡因。
來自柯林斯例句
5. The shaking inside may be due to low blood sugar, too much caffeine or too many cigarettes.