When the confirm order is sent to the service consumer, the consumer might change the order (for example, the user might change the quantity due to a change in price) and place the buy order again.

当确认订单发送到服务消费者时，消费者可能会修改订单（例如，客户可能会因为价格改变修改数量），并再次下购买订单。

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When a remote wireless signal is sent, a tiny electrical current zaps the chip to release the desired quantity of the drug.

当遥控无线信号发出后，一股微小的电流将激活芯片释放需要的剂量。

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I am writing this letter specially to apologize to you due to the error in quantity of the shoes we sent.

此信是为了我们给您发送的鞋子的数量错误，而专门向您道歉的。

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While the quantity of letters sent is falling, the number of parcels being mailed is growing due to the rapid spread of online shopping and sites like eBay.

BBC: How much does Royal Mail make from undelivered parcels?

Imagine filling up at the gas station with a pump that showed neither price nor quantity, but the gas station sent you a bill five weeks later.

FORBES: Engaging the Electric Grid - From Information to Intelligence

In this context it refers to the card that is sent to reorder a standard quantity of parts as and when they have been used up in the manufacturing process.

ECONOMIST: Idea