Don't tie [put on] your shoes in a melon patch or adjust your hat under a plum tree -- avoid being suspected.; Don't do anything to arouse suspicion.

瓜田不纳履， 李下不整冠。

《新英汉大辞典》

A supermarket sold a melon for $100 to a Frenchman at Christmas.

在圣诞节之际，一家超市以100美元的价格将一个甜瓜卖给了一位法国人。

youdao

A piece of candy, a melon, a handful of dates…

一块灶糖、一个甜瓜、一把红枣……

youdao

Kanevsky answered it, and, despite having no experience or credentials, persuaded Slatkin to let him create a melon-shape porcelain tureen on spec.

WSJ: Porcelain Flowers Never Die

Anyone brave enough to delve into its spells may learn how to use magic to manufacture fake gold, calm a wild horse or ripen a melon.

BBC: The Channel Islands�� surviving lore

And you only have to look under the hood or crawl beneath the car to see a technological nightmare: A low-compression flathead V-8, cloth wrapped wires, a crude carburetor, leaf springs and no shocks, big mechanical brakes that were about as useful as an anchor, and a differential the size of a melon, to appreciate that this car was a polluting, rattling, death trap.

FORBES: The Coupe Coup