别跟那些连这么简单的问题都搞不懂的笨蛋争论了。

Don't argue with those ___pinheads who can't even understand such a simple question.

显微镜下可以看到这些微小的颗粒，它们就像针尖一样小。

Under the microscope, these tiny particles look as small as ___pinheads.