Y
You cannot have your cake and eat it. 有得就有失。事难两全其美。
Youth's a stuff will not endure. 青春易逝。
You are never too old to learn. 活到老学到老。
You never know till you have tired.事非经过不知难。
Z
Zeal without knowledge is fire without light. 热情而无知，犹如无光之火
Zeal without kowledge is the sister of folly. 无知的热情近乎愚蠢
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