观察过蜗牛之后，认识其家是个螺旋状的壳，然后以简单线条画出大小不同的蜗牛。

Observe the snail and their special 'home'. Then use simple lines to draw some snails.

youdao

观察过蜗牛之后，认识其家是个螺旋状的壳，然后以简单线条画出大小不同的蜗牛。

Observe the snail and their special 'home'. Then use simple lines to draw some snails.

youdao