英语语法问题?
Asroadwayschokeontraffic,researcherssuspectthatthetailpipeexhaustfromcarsandtrucks—es...
As roadways choke on traffic, researchers suspect that the tailpipe exhaust from cars and trucks—especially tiny carbon particles already implicated in heart disease, cancer and respiratory ailments—may also injure brain cells the key to learning and memory. 这个长句的最后一部分 the key to learing and memory可不可以看作brain cells 的同位语?然后中间加上连词that 这样有没有语法问题
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