有一个英文谜语：my first is in sorrow,but not in sad

有一个英文谜语：my first is in sorrow,but not in sad
my first is in sorrow,but not in sad.my second is in girl,but not in lad.my third is in near,but not in far.my fourth is in train,but not in car.my fifth is in sure,but not in slow.my sixth in is reap,but not in snow.my whole is the season of frost and snow.what an