enter

hibernation

to hibernate

sleep, dormancy

sleep; be dormant

熊: (animal) bear

long / (time) long, lengthy

to go in; to come in / 要る: to be necessary, to be required

to enter, go into, get into a place or a thing / to join a group or organization / to be contained (in), to be included (in) / to be a member of a group, set, category

chief, head, leader