A glassful is as much liquid as one drinking glass will hold — one glass of something. “A glassful of water” names the amount, not the glass itself.

a glassful一個「一杯的量」 is就是 as much liquid一杯液體 as one drinking glass will hold一個喝水杯裝得下的量 — one glass of something就是一杯某東西。"A glassful of water"「a glassful of water」 names the amount講的是量, not the glass itself不是那個杯子本身。

It is a homely measure word, like spoonful or handful, and you will meet it with water, milk, wine, or medicine.

it它 is a homely measure word是一個家常的量詞, like就像 spoonful或handful spoonful或handful, and而且 you你 will meet it會遇到它 with water水, milk牛奶, wine酒, or或 medicine藥水。

Though actually, people do not always mean a glass filled right to the brim; it often just means “about one glass.” In everyday talk many people simply say “a glass of,” so glassful can sound a little careful or old-fashioned, but it is still ordinary in recipes and with children.

though actually不過其實, people人 do not always mean不一定是指 a glass filled right to the brim一杯裝到杯緣的水; it它 often就是通常 just means只是指 "about one glass"「大概一杯」。in everyday talk在日常對話裡 many people很多人 simply say直接說 "a glass of,"「a glass of」, so所以 glassful這個字 can sound聽起來 a little careful or old-fashioned會有點講究或老派, but不過 it它 is still ordinary還是很常見 in recipes在食譜裡 and和 with children跟小孩講話時。

You can have two glassfuls. The -ful here means “the amount that fills,” not “full of glass.”

you你 can have two glassfuls可以有兩杯的量。the -ful here這裡的-ful means指的是 "the amount that fills"「裝滿的那個量」, not而不是 "full of glass"「裝滿了玻璃」。