There is no royal road to learning.
学问无坦途。/书山有路勤为径,学海无涯苦作舟.
A man becomes learned by asking questions.
不耻下问才能有学问。
It is never too old to learn.
活到老，学到老。
Absence makes the heart grow fonder.
小别胜新婚; 距离产生美; 久别情更深。
When the cat is away, the mice will play.
山中无老虎，猴子称大王。
No cross, no crown.
不经历风雨，怎么见彩虹。
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