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

在派生类中重写后，异步地将消息从源块传递至该目标块。

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

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。

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Since this block is a source, it may be linked to other target or propagation blocks.

由于传播块也是源，因此它可以链接到其他目标或是传播块上。

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H2O Blocks is our ability to source block liquidity from the upstairs market and push it to our buyside Members.

FORBES: Crafting Market Structure Regulations

Mr. Obama's goal is to restore billions of dollars to community block grants, a key source of funding for cities, with the new office shepherding the disbursements.

WSJ: Race Issues Stay Below the Radar

Another source might be Russia, Ukraine and other former Soviet-block countries, which have plenty of helicopters, but have so far offered few of them.

ECONOMIST: Choppers are vital��and hard to find