normal flow rate的用法和樣例：
例句
- Criteria for selection is minimum flow, normal flow, maximum flow and pressure drop across the valve.
選型標準是最小流量，正常流量，最大流量和通過閥門的壓降。 - Pages are reformatted and compressed before being sent to the phone, so they only use about one fifth of their normal amount of traffic.
發送之前，對面進行重定格式和壓縮，所以流量僅是正常流量的五分之一。
