他在商店买了一包口香糖。
He bought a pack of ___gum at the store.
健康的牙龈是坚实和粉红色的，不是红色或肿胀的。
Healthy ___gums are firm and pink, not red or swollen.
午饭后，她递给了我一块口香糖。
She offered me a piece of ___gum after lunch.
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