blank [blaenk]

a.空(白)的;没表情的;

n.空格，空自处;

v.突然忘掉;不理睬

例句：

Infants are wired to look at parents' faces to try tounderstand their world, and if those faces areblank and unresponsive-as they often are whenabsorbed in a device-it can be extremelydisconcerting for the children.

婴儿生来(are wired to)就靠观察父母的面孔理解世界，如果这些面孔毫无表情也无任何反应-他们沉溺于电子设备时往往是这个样子--这会让孩子们感到非常不安。