very formal, rarely used in everyday speech; mainly appears on product labels or in medical writing
用法筆記
Toothpaste is an uncountable noun — do not say 'a toothpaste'. Instead use 'some toothpaste' or 'a tube of toothpaste' when referring to one container.
常見錯誤
I bought a toothpaste for my trip.
I bought some toothpaste for my trip.
toothpaste is uncountable; use 'some' or 'a tube of'.