1. An onion bulb; a tulip bulb. 
   洋葱球；郁金香球根
2. young onion before the bulb has enlarged. 
   球茎增大前的嫩洋葱。
3. Having a tunic, as the bulb of an onion. 
   有膜皮的，有鳞片的，如洋葱球的茎
4. A dry martini garnished with a small pickled onion. 
   吉普森酒一种干马丁尼酒，以小腌洋葱作配菜
5. an ordinary thermometer with a dry bulb; used to measure the air temperature. 
   带有干球的普通温度计；常用于测量空气温度。

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