黑熊幼崽用树来防御，而经常生活在没有树的环境中的棕熊和北极熊则依靠攻击性来保护它们的幼崽。
Black bear cubs use trees for defense, whereas brown bears and polar bears, which regularly inhabit treeless environments, rely on aggression to protect their cubs.
问题在于人们还没有意识到保护环境的重要性。
The problem lies in that people still haven't realized the importance of environmental protection.
以前的NFS版本都没有这种能力，因此不能对保护的质量、数据的完整性、认证的要求或加密类型进行协商。
Past NFS versions did not have this ability and therefore could not negotiate for the quality of protection, data integrity, the requirement for authentication, or the type of encryption.
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