Supplement: Walking in Gua Tian, you will always meet watermelons, because watermelons are round, so they are round.
Similar two-part allegorical sayings include:
Throw watermelon into the partition-quench others' thirst
Cut the watermelon in the pot-no water leakage; Not a drop leaks.
The monkey holds the watermelon-attend to one thing and lose another.
Watermelon in the soybean field-a big one.
Picking your teeth and chewing watermelon-there are many ways
Eggs and watermelons-can't stand beating.
Picking up sesame seeds and losing watermelon-penny wise and pound foolish.
Foot on a stick, watermelon on your head-both ends slip.