third-person singular simple present of hum

• produces a low, continuous sound
• sings a wordless tune with closed lips
• is busy and vibrant, like a beehive

英语动词 hum 的一般现在时第三人称单数

• 发出低沉持续的嗡嗡声
• 闭口哼唱无词的旋律
• 繁忙而有生气地运转

plural of hum

• low, continuous sounds or background drones
• short wordless tunes
• bustle of activity, like a beehive

hum 的复数

• 低沉连续的背景嗡嗡声
• 无词的短促哼唱
• 蜂巢般的忙碌景象

plural of HUM (“Highly Unusual Methods”) in contract bridge

• unconventional bidding systems requiring prior disclosure

桥牌术语 HUM（高度非常规叫牌法）的复数

• 需事先披露的非常规叫牌体系