求英语大神帮我看下这个英语句子.
Intheshark'sjaws,manyspareteethlieinseeminglylimitlessreserve,eachonereadytoslideintotheappropriatepositionwheneveranactivetoothislostorworndown.
为什么eachone后面的is要省略掉,这个句子是作什么成分?定语?