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