Both the refreshed key chain and the identity chain are of backward security.
该方案更新的密钥链是后向安全的，参与者提供的身份链也是后向安全的。
Process, people and asset are three key elements in cold chain.
提高冷链的效率需要从流程、人员和设备三个方面着手。
Company's products include high low key, key chain, buckles and other automotive products.
公司产品包含中高低档钥匙，钥匙扣、插扣等各种汽车精品。
Company's products include high low key, key chain, buckles and other automotive products.
公司产品包含中高低档钥匙，钥匙扣、插扣等各种汽车精品。
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