Device for increasing the current in a circuit.

【电】升压器。

Radio-frequency amplifier placed between the antenna and the receiving set.

(无线电)增幅器。

Rocket that launches an aerospace vehicle.

发射太空船的火箭。

An auxiliary rocket.

辅助的推进火箭。

An enthusiastic supporter.

【美】【口】热心的拥护者。