一日三餐的英文：
three meals a day

参考例句：

She is trying to dispense with the necessity of eating three times a day
她正设法摆脱一日三餐的那种必然常规。

This leaves her ample time to prepare three meals a day.
这样她就有充裕的时间准备一日三餐饭。

We had excess food to shame us at every meal, excess clothes to fling about us in the heat of play
我们吃食太多，令我们一日三餐不胜羞愧，衣服太多可以在玩耍得热火朝天时把穿不了的衣服抛来抛去。

three是什么意思：
num. 三，三个

three coat,three bake
“三涂三烘” 工艺(反复涂三道漆，烘干三次的施工方法)

fiveteen contains five and three.
15可被5和3除尽。

To draw three feet of water
吃水三尺

day是什么意思：
n. 一天；白昼，白天；工作日；时代，时期

Things go on day by day.
事情逐日进行着。

Day by day the situation is improving.
情况在一天天地好转。

Like this, day after day.
就这样，日复一日。