watermelon的复数：watermelons：n.西瓜

短语：watermelon juice 西瓜汁

watermelon seed 西瓜子

例句：

Watermelons sell fast during the dog days.

大伏天西瓜卖得快。

Watermelons are in season now.

西瓜正在喷儿上。

When summer came, there were many big round watermelons in the field.

夏天到来的时候，有许多大的圆的西瓜。

I like cold fruit juice made from watermelons and yogurt.

我喜欢由西瓜和酸奶制成的冷冻果汁。