早知文理百科

case主要用作可数名词,偶尔也可用作不可数名词。其复数形式为cases，意思是情况、案例。 例句 Ten new cases of bird flu were reported yesterday. 昨天新...

pick的过去式形式是picked。picked的意思是选择，挑选，采，摘，（用手指）摘掉，剔除，掐去。picked的例句A police dog picked up the murderer\'s scent（...