基本解釋助聽(tīng)器用電子管英漢例句雙語(yǔ)例句Others have pointed out that it could be a vacuum-tube hearing aid, which was first sold in 1921.其他人指出那可能是個(gè)真空管的助聽(tīng)器，助聽(tīng)器最早在1921年銷售。hearing-aid tube更多例句