1.back and forth 反復地,來回地
The old man, still pacing back and forth, ceased to speak aloud, and began to mutter.
老人仍在來回踱步,不再大聲說話,開始喃喃自語起來
2.accustom oneself to 使……習慣于
A good traveler can accustom himself to almost any kind of food.
一個善于旅行的人幾乎能使自己習慣于任何一種食物
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