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1.VOA's Steve Baragona reports that new research says there might have been a weak spot in the polio vaccine.
weak spot弱点
Skiing remained the weak spot of the Chinese team.
滑雪仍是中国队的弱项。
2.The study says a mutated polio virus was responsible for that unusually deadly outbreak.
be responsible for为…负责，形成…的原因
Who will be responsible for the expedition's supplies?
谁将负责探险队的物资供应？
3.The researchers of the study say their findings show new and dangerous kinds, or strains, of polio may emerge as the goal of getting rid of the virus nears.
get rid of除掉，去掉
You seem in rather a hurry to get rid of me.
看起来你急于想摆脱我。
4.He blames Congo's civil unrest in the 1990s and early 2000s that had messed up vaccination campaigns.
mess up弄乱，弄糟
He got another chance and didn't want to mess up again.
他又获得一次机会，这次他再也不愿意把事情弄糟了。
