Male crickets make a noise by rubbing their wings together.雄性蟋蟀通过摩擦翅翼来发出声音。Since Ned was still asleep, she jacked in the earphone to cut off loudspeaker sound.因为纳德还在睡觉，她插上耳塞不让扬声器发出声音。I knew that if I made any sound, they would find me.我知道我一发出声音，他们就会发现我。