annually-renewable的意思,an annually-renewable contract是什么意思

annually renewable 每年更新的
　　
　　例子：
　　1.PLA is made from the annually renewable resources corn. PLA 由每年可再生资源谷物制成
　　2.Renewable materials from annually agricultural feed stocks have attractedattention in recent years. Protein is a kind of biodegradable and environmentallyfriendly material.
　　近年来农业可再生材专料受到人们的重视， 蛋白质属是可生物降解的环境友好材料

an annually-renewable contract
　　每年知的可再生合同
　　
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