Definition: when a type of animal no longer exists Level: C1
许多物种面临灭绝的威胁。
Many species face the threat of ___extinction.
由于栖息地丧失，熊猫曾濒临灭绝。
Pandas nearly faced ___extinction due to habitat loss.
人类活动加快了物种灭绝的速度。
Human activities have accelerated the rate of ___extinction.
