main-line meter

• 干线水表

main-line meter的用法和样例：

例句

1. The water meter is just beside the back door in the kitchen.
   水表就在厨房门的后边。
2. The auxiliary line shall consist of an approved backflow preventer and water meter.
   辅助管路应该由通过认证的防回流阀和水表构成。