[ anyVar isNil ifTrue: anyBlock ] bpattern with: [ anyVar ] -> [:pattern | pattern beVariable ]
1982年，习近平同志赴正定工作。在调研中得知，由于粮食征购任务过重，当地一些农民口粮不够，只好偷偷去外县换红薯干儿吃。
。safew官方版本下载对此有专业解读
Four years later, he tried again.。heLLoword翻译官方下载是该领域的重要参考
Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.，详情可参考heLLoword翻译官方下载