yeast

yeast — 名詞

1. a type of microscopic fungus that people mix into bread dough so the dough expan

1.名詞B1
釋義

酵母

用於烘焙和釀酒的微生物

a type of microscopic fungus that people mix into bread dough so the dough expands and becomes light; brewers and winemakers also add it to fruit or grain liquids so the natural sugar changes into alcohol.

例句

Romi added dried yeast to the warm milk and sugar before mixing in the flour.

Romi 在溫牛奶和糖裡加入乾酵母，然後拌入麵粉。

dried yeast (common form)

The bread did not rise well because the yeast was too old to work.

麵包沒有發得很好，因為酵母放太久已經失效了。

yeast + rise / too old to work

同義詞
  • leaven

    more general term for any substance that makes dough rise; 'leaven' can also be used figuratively, while 'yeast' is mainly literal and concrete

  • starter

    a naturally fermented mixture of flour and water that contains wild yeast, used in sourdough bread; 'starter' is a specific product rather than a general type of fungus

反義詞
  • baking powder

    a chemical leavening agent that works through acid-base reaction rather than living fungal activity; used when no fermentation flavour is wanted

文法句型

yeast + [verb]

dried/active/fresh + yeast

yeast + for + [purpose]

用法筆記

In everyday cooking, yeast usually refers to the dry or fresh product sold in packets or blocks. Active dry yeast and instant yeast are the two most common forms. All-purpose flour is often paired with yeast in standard bread recipes.

常見錯誤

❌The yeast made the bread taste sweet.
✅The yeast made the bread rise and become fluffy.
💡Yeast causes rising through fermentation, not sweetness. Sugar may be added to feed the yeast, but the yeast itself does not make bread sweet.
❌I forgot to put yeast in the cake.
✅I forgot to put yeast in the bread.
💡Cakes usually use baking powder or baking soda as a leavening agent, not yeast.

2. a single-celled type of fungus that can multiply by splitting or forming buds, a

2.名詞B2
釋義

酵母菌

單細胞真菌，可出芽繁殖

a single-celled type of fungus that can multiply by splitting or forming buds, and that causes the chemical process in which sugar changes into alcohol.

例句

Under the microscope, Gabriel could see the round yeast cells splitting to form new ones.

在顯微鏡下，Gabriel 可以看到圓形的酵母菌細胞正在分裂出新的細胞。

yeast cells splitting (budding reproduction)

Biologists study yeast as a model because it grows fast and shares genes with people.

生物學家以酵母菌作為模式來研究，因為它生長快速且基因與人類共通。

yeast as a model organism in research

同義詞
  • fungus

    much broader category that includes mushrooms and moulds; 'yeast' is one specific type of fungus

  • Saccharomyces cerevisiae

    the scientific name of the most common baker's and brewer's yeast; far more technical than 'yeast'

  • microorganism

    even broader term covering all microscopic life forms (bacteria, protozoa, etc.), not specific to yeast

文法句型

yeast + cell / strain / culture

yeast + reproduces / grows / ferments

用法筆記

This sense is mainly used in biology and microbiology. 'Yeast' in this context is an uncountable noun referring to the whole group of organisms (Saccharomycetes). When referring to individual species, writers often use 'yeasts' as a countable plural.

常見錯誤

❌Yeast is a kind of bacteria.
✅Yeast is a kind of fungus.
💡Yeast belongs to the fungus kingdom, not to bacteria. The two groups differ in cell structure, reproduction, and genetics.
❌Each yeast has one cell.
✅Each yeast cell is a single organism.
💡'Yeast' as an uncountable noun names the group; for individual organisms say 'yeast cell' or use the plural 'yeasts' when listing species.

yeast — 動詞