饼干英文biscuit是可数名词。

biscuit

n.饼干;松饼(食用时常佐以肉汁);淡黄褐色

复数： biscuits

例句：

Check the space of biscuit market in China

中国饼干市场的未来空间

Spoon the mixture on to the biscuit base and cook in a preheated oven

把混合好的糊糊舀到饼干坯上，然后放入已预热的烤箱烘烤。

He started to nibble his biscuit

他开始啃饼干了。

You've done some stupid things before, but this really takes the biscuit!

你以前的确也干过些蠢事，但这一次实在吓人！