翻译成英语：水和面粉的比例是1：1

楼上正解！
The proportion of the water and the bread flour is 1 to 1.
to有一种用法就是表示比例。格式是：数词＋to＋数词.

The ratio of the water to the flour is 1.

The ratio of water and flour is 1:1.
当然读是读成1 to 1

The ratio of the water and the flour is one to one.

注释：这里的“水”和“面粉”都是特指的，需要加定冠词 the 才行。

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