為什麼暑假比較長,而寒假比較短呢?
f0 `" X6 G, h4 l2 [& `% btvb now,tvbnow,bttvb5.39.217.77:88982 C# N6 Y$ u% {0 t3 c# j1 I
4 K7 }6 z6 G& x$ ^5 ~% X+ `( z2 v5.39.217.77:8898tvb now,tvbnow,bttvb0 y7 ] x: N, ~. m0 ^' N$ B
5.39.217.77:8898 C5 ?6 @$ a+ C8 P# W4 S
答:因為熱漲冷縮 |