改天的英文：
some day

参考例句：

Sometime we can get together for coffee.
改天我们一起喝咖啡。

Well... I'll see you around.
好吧，改天见。

Can I take a rain check?
你能改天再请我吗?

some是什么意思：
adj. 一些的，若干的
adv. 非常；大约
pron. 有些人，有的东西

Some were employers, some employees, some masters, some handymen
有的是老板，有的是伙计，有的是业主，有的是干零活的。

Would you like some leg or some breast ?
你要腿肉还是胸脯肉?

It was some foul parody, some infamous ignoble satire.
这是一个卑劣的讽刺，一个鄙俗、邪恶的嘲弄。

There were some holes in that theory, some unanswered questions.
那个理论中有一些漏洞，一些问题没有解答。

The world is a ladder for some to go up and some down
人世如梯子,有人上去有人下

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。

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。