Listening, one of the four language skills, is important but difficult to master.
听是四大语言技能中十分重要，但又难以掌握的一种技能。
English writing is one of the four basic skills an English learner must master.
英语写作是英语学习者必须掌握的四项基本技能之一。
Master life's four treasures: sleep soundly, eat well, laugh hard, and work happily.
安心睡、快乐吃、欢喜笑、健康做，是人生四宝。
Master life's four treasures: sleep soundly, eat well, laugh hard, and work happily.
安心睡、快乐吃、欢喜笑、健康做，是人生四宝。
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