基本解釋助聽器用電子琯英漢例句雙語(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)真空琯的助聽器，助聽器最早在1921年銷售。hearing-aid tube更多例句