design water level

例句：

1. 1. The engineer has designed a water level for the reservoir to ensure proper operation.
   工程师已经为水库设计了一个水位，以确保正常运行。
2. 2. The construction of the new bridge required careful consideration of the design water level.
   建造新桥时，需要仔细考虑设计水线。
3. 3. The flood control system was designed to maintain a safe water level in the river.
   洪水控制系统被设计来保持河流中的安全水位。