他们有的堆雪人，有的打雪仗，还有的正在用雪垒城堡。
They make a snowman, snowball fights, and the bases are using snow castle.
开始的时候里面的人一定要小心工作了防止雪墙倒塌，一块一块垒到第三层的时候雪墙就能自已支撑住不倒了。
Initially, the person inside must work carefully to prevent the blocks from falling; after three or so blocks are placed side by side, they should hold themselves up.
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