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back and forth来回地
例句：The wind moved the trees gently back and forth.
风吹得树轻轻地来回摇晃。
2.A VA hospital may have exposed more than 1,800 vets to hepatitis and HIV.
expose to暴露于
例句：Don't expose it to the sun.
谨防日晒。
Don't expose undeveloped film to light.
不要把未冲洗的胶卷暴露在光照下。
3.It's funny to think that, you know, 30 years into this of made a living teaching Long Island people how to use their arms.
make a living赚钱过活
例句：He makes a living by writing.
他靠写作谋生。
She heard that it was easier to make a living in the big cities.
她听说大城市谋生容易些。
