It is a matter of space, a matter of supplies and a matter of security.
这是空间问题，是供应问题，是安全问题。
The user supplies a secret key (password) to the security server to prove its identity.
用户向安全服务器提供一个秘密密钥（密码）来证明其身份。
Farmers were also starting to fear for the security and quality of their water supplies.
农民也开始担心他们用水供应的安全与质量。
Farmers were also starting to fear for the security and quality of their water supplies.
农民也开始担心他们用水供应的安全与质量。
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