成天的英文：
all day long
all the time

参考例句：

He had been bumming about (around) the house all day
他成天在房子周围游来荡去。

I can't be bothered with seeing you quarrelling all day long
我不喜欢看见你们成天吵架。

Regular hotbed of it lately
近来这帮人成天泡在那儿。

You will never be a good student so long as you goof around.
如果你成天游手好闲，就永远也成不了好学生。

-- Don't mope over it all day, he said
“不要成天为这档子事闷闷不乐。

I thought the ants would be tired from their daylong work
我认为这些蚂蚁会因为成天劳动而累了。

Why don't you do some work instead of just frigging around all day?
你干嘛不去干点工作而不再成天鬼混呢？

Addressing envelopes all the time is dreary work.
成天给信封写地址是一种沉闷单调的工作。

Cheer up. Don't be such a sourpuss.
快乐一点吧。不要成天绷着个脸。

If Pitt didn' t spend so much of his time chasing around after girls he might have done something useful
要是皮特不是成天在女孩子们身边打转，他本来是可以做点有益的事情的。

all是什么意思：
adj. 一切的，所有的；整个的；各种的
pron. 一切；全部；大家，全体
n. 全部财产；所有一切
adv. 完全地；极其

The policy of burn all,kill all,loot all
三光政策

It is all on the house.
费用全由敝店支付。

(all) in a twitter
(极度) 紧张[兴奋],激动

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。

long是什么意思：
adj. 长的；长时间的；冗长的；长音的
adv. 长久地，长期地；始终
n. 长时间，长时期；长音节
v. 渴望
abbr. 经度，经线

But perhaps not for long.
但这并不会持续太长时间。

It will take a long time to read through this long story.
要读完这长篇故事要花相当长的时间。

propagation of long and very long wave in the ionosphere
电离层长波和超长波传播