Detect when block is added to Grand Central Dispatch?
检测时，块被添加到中央调度？
The block 1 is located in the central depression of Junggar basin.
准噶尔盆地中部1区块位于准噶尔盆地的中央坳陷带。
A major office block collapses in Chaoyang, Beijing's central business district.
北京朝阳商业办公区某幢大楼倒塌。
A major office block collapses in Chaoyang, Beijing's central business district.
北京朝阳商业办公区某幢大楼倒塌。
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