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重点讲解：
1. focus on 集中(注意力)；关注；
The research effort has focused on tracing the effects of growing levels of five compounds.
研究重点追踪了5种化合物含量上升的影响。
2. along with 与…一起；
The baby's mother escaped from the fire along with two other children.
婴儿的母亲和另外两个孩子一起逃离了火海。
3. at least （数量）至少，不少于；
He had been sitting on the document for at least two months.
他已经将这份文件压了至少两个月。
4. contend with 竞争；争夺；
It is time, once again, to contend with racism.
又一次到了与种族主义战斗的时刻了。
adj. 天生的，固有的
