苦瓜的英文：
bitter melon
bitter gourd

参考例句：

They are, as the saying goes, "bitter melons growing on the same vine".
他们就像俗话说的，是一根藤上的两个苦瓜。

bitter是什么意思：
adj. 苦涩的，有苦味的；难以接受的；憎恶的；严寒的
n. 辛酸，苦味，苦酒

The medicine is as bitter as gall.
这药像胆汁一样苦。

They have been racked by bitter quarrels.
激烈的争吵使他们不得安生。

The discussion deteriorated into a bitter quarrel.
这场讨论演变成了激烈的争吵。

melon是什么意思：
n. 瓜，甜瓜

The melon was good and sweet.
这瓜很甜。

Melons taste better if they are chilled.
冰镇的西瓜味道要好得多。

Europeans take melons for a preventive against seasickness.
欧洲人吃瓜作为预防晕船的方法。

gourd是什么意思：
n. 葫芦科植物，葫芦（晾干后常作容器）

The gourd is the key which opens a rich door.
葫芦是打开富贵门的钥匙。

Any of various mostly climbing or trailing plants of the family Cucurbitaceae, which includes the squash, pumpkin, cucumber, gourd, watermelon, and cantaloupe.
葫芦科植物任一种葫芦科的多数为攀缘或蔓生植物，包括有南瓜属植物、西葫芦、黄瓜、葫芦、西瓜和甜瓜

With a shaldng hand he reached inside his quilt and brought out his pottery gourd.
他的手哆嗦着，把闷葫芦罐儿从被子里掏了出来