floatless level control

例句：

1. 1. The boat was designed tobe floatless for easy maneuvering.
   这艘船设计成无浮力，便于操控。
2. 2. The raft was madeof non-floating materials to withstand the current.
   筏子是用非浮力材料制成的，以抵御水流。
3. 3. Thenew design is floatless, which makesit easier to transport heavy items.
   新设计是无浮力的，这使得运输重物更加容易。