氷河期

(1)any period of time during which glaciers covered a large part of the earth's surface; "the most recent ice age was during the Pleistocene"

(2)地表の大部分を氷河が覆った時代

(3)from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution

(4)2百万年前から1万1千年前まで

(5)北半球の広範な氷河化

(6)人類進化の時代