《他·她书系：胡桃树丫丫》讲述胡桃树丫丫还是一棵树苗，胆怯，害羞，还没学会和别的树说话。也没有学会和孩子说话？她很瘦弱，身体上只有稀疏的几个小丫权，上面挂着两三片树叶，不会开花，自然也不会结果了。她喜欢用一片树叶捂着自己的脸，仰着脑袋，从指缝里面偷偷打量周围的世界。Series of He/She: Walnut Tree Yaya tells a story about a walnut sapling Yaya, who is timid, shy and doesn't know how to communicate with other trees or children. She is thin, with merely several braches and few leaves. She cannot come into flowers, nor can she bear walnuts. Usually, she is fond of observing the circumstances through her fingers under the cover of a leaf while titling her head back.