不可数，因为melon seeds是不是可数名词

melon seeds是瓜子的意思，seeds已经是复数形式所以不可数，但是seed是可数名词，复数形式是seeds

双语例句

1、"Melon Seeds" Theory Application on Library Basic Level Management.

2、Ideas About the Packaging of Some Food Like Melon Seeds.

瓜子类小食品包装的新想法。

3、The study on the working coefficients of white melon seeds screen machine.