天数的英文：
number of days

参考例句：

The deduction is allowed for a single overseas trip over 30 days.
一次临时离境超过30天可以扣除天数。

Number of entries Single Double Multiple Duration of each stay
拟入境次数一次二次多次每次停留天数

Planned days of turnover of current capital
流动资金计划周转天数

Current fund turnover days
流动资金周转天数

Days in Years;Accounts Receivable Turnover
每年天数;应收账款周转率

This villain of mine comes under the prediction
我这畜生也是上应天数。

To specify the number of days that the History list keeps track of your pages
指定网页保存在历史记录中的天数

Bicycle can be hired by the hour or by the day .
自行车可按小时或天数计费租借使用。

If you fail to come and renew the book, you'll be fined for each day it 's overdue. "
如果您没来续借，那么就得按过期天数罚款。

Yes, or you'll be fined for each day it's overdue.
是的，否则你就得按超过的天数付罚金。

number是什么意思：
n. 数；号码；算数
v. 给…编号；计算，数

The number was fifty.
该数字为五十。

There is safety in numbers
人多势众

It was an irrational number.
这是一个无理数。

Which number on the card is a prime number?
在卡片上哪一个数字是最初的数字？

The number raised to the logarithm of a designated number in order to produce that designated number.
被升到指定数字的对数上的数量,是为了得到那被指定的数目。

days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。

It was a fateful day.
那是个不祥的日子。

Meantime, from day to day they endure.
同时，一天天他们捱了下去。