The main factor lead to impacted teeth was insufficient interdentium.

发生阻生的局部因素主要是牙间隙不足。

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One possible confounding factor, however, is that the children were not tested for lead exposure when they were toddlers.

然而一个可能的混淆的因素是孩子没有被测试是否在刚学走路时就处在污染环境中。

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Does the feelgood factor lead to a boost in consumer confidence, and therefore a tangible economic effect?

BBC: Going for the happiness gold

The hope being that the size and form factor will lead people to using them to read the newspaper apps which said papers can charge for.

FORBES: Will The Mini-Tablets From Apple, Google, Samsung, Revive The Newspaper Industry? Probably Not

Moody's, for example, said doubts about the political sustainability of future cuts were a big factor that might lead them to downgrade the UK's credit rating even further.

BBC: Budget 2013: The domino theory of deficit reduction