在派生类中重写后，异步地将消息从源块传递至该目标块。

When overridden in a derived class, asynchronously passes a message from a source block to this target block.

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加拿大地球物理学家 Tuzo Wilson 意识到，如果一块在内部固定火山源上移动的表面板块形成了岛屿，就会导致岛屿年龄增加。

Canadian geophysicist Tuzo Wilson realized that this age progression could result if the islands were formed on a surface plate moving over a fixed volcanic source in the interior.

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例如，只有在自创建快照以后源数据块被更改，才会从快照读取。

For instance, the read will occur from the snapshot only if the source block has changed since the snapshot was created.

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