back-and-forth

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He said, "I don't care, I know what happened to me."And we went back and forth and back and forth,and make a long story short,

"Yes, but we mean the program."And back and forth.Luckily for us, they met us with laughter, very, very good laughter,

like the size of big church bells,swing back and forthand the mass of them is such

And I still worked as a tour leader,traveled back and forthin China, Tibet and Central Asia.

so we start experimenting againand we push the pendulum back and back and forth and back and forthwe've gone for the last 300 years,

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剑桥雅思阅读真题4-15,经济学人(The Economist),医学英语(The Language of Medicine)