2.2.3 Mermaid 类图（classDiagram）
When adapting to a ReadableStream, a bit more work is required since the alternative approach yields batches of chunks, but the adaptation layer is as easily straightforward:，这一点在爱思助手下载最新版本中也有详细论述
。搜狗输入法下载是该领域的重要参考
many items are in c.)
Photograph: Simon Hill，详情可参考safew官方下载