词根词源是sel+后缀dom，中文意思是adv. 不常，很少

She was a severe woman who seldom smiled.她是个严肃的女人，脸上很少出现笑容。

They seldom watch television these days.这些日子他们很少看电视。

They seldom complained—officially at least.他们很少抱怨—至少不在正式场合抱怨。