S2: It's blue. It's the blue sky.
在黑板上粘贴蓝天的挂图。
S2: Oh, really?May I have a look?
哦，真的吗?我可以看一下吗?。
S2: I go to Yangshan twice a month.
我每月去两次阳山。
你最喜欢钱。
S2：他们是六个男孩。
我还可以滑雪。
S2:He can buy a map, he can find the way with it.
他可以买一张地图，在地图上可以找到去天津宾馆的路。
S2: So, it wasn't just colour that was important to him.
所以不仅仅是颜色对他很重要。
The base case is whenever S1 or S2 is a zero-length string.
（基线条件（basecase）是S1或S2为长度为零的字符串的情形。
S2: That seems pretty big. But I guess Canada is a big place.
队伍似乎很庞大。不过我想加拿大奉身也是个大国家。
So that is actually making a copy of the address and putting it in s2.
这实际上是复制一个地址，然后放置在s2中。
S2 My cut has been stitched up and I could now stride along the street.
S2我的伤口已经缝合，我可以大步的走在街上。
And actually, I will choose another surface, S2, that maybe looks like that.
实际上，我将选择另一个曲面s2，它看起来应该是这样的。
And actually, I will choose another surface, S2, that maybe looks like that.
实际上，我将选择另一个曲面s2，它看起来应该是这样的。
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