The abstract data buffer allocates the memory blocks when and only when the actual data becomes available.
抽象数据缓冲区仅在实际数据变得可用时才分配内存。
And this is what logistics is chiefly concerned with. Products are of any value when and only when they are moved to the right place where it is available to the customer.
而这也正是物流所关心的，产品只有在被运送到能被消费者买到的场所时才体现出价值。
When, and only when, these behaviors occur does an authority relationship exist between the superior and subordinate.
当且仅当这些行为发生时，在上级和下级之间才存在一种权威关系。
When, and only when, these behaviors occur, does an authority relationship exist between the superior and subordinate.
当且仅当这些行为发生时，在上级和下级之间才存在一种权威关系。
When, and only when, these genes are turned on do the bacteria make these proteins and light up.
在且仅在这些基因被激活的情况下，细菌才会制造相应的蛋白，并将其点亮。
When, and only when, these genes are turned on do the bacteria make these proteins and light up.
在且仅在这些基因被激活的情况下，细菌才会制造相应的蛋白，并将其点亮。
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