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businessman /ˋbɪznɪsmən/ n. [C] 商人 

My father is a businessman, and he is always busy with his business. 
我爸是個商人，他總是忙著做生意。

The businessman is having dinner in the restaurant. 
那位生意人正在餐廳用晚餐。

Mr. Huang is a businessman; he sells a lot of things in his supermarket. 
黃先生是一位商人；他在他的超級市場賣很多東西。

difficult /ˋdɪfə͵kəlt/  adj. 困難的；難相處的 

They found out it is difficult to sell the product. 
他們發現要賣這個產品非常困難。

It is difficult for him to pass the test. 
他要通過考試很困難。

He is difficult. 
他是一位難相處的人。

head /hɛd/  n. [C] 頭 

Bob was hit on the head. 
鮑伯被打到頭。

If the answer is positive, nod your head. 
如果答案是肯定的，就點頭。

once /wʌns/  adv. 一次 

The man has to take pills once a week. 
這位男士一週需要吃一次藥。

repeat /rɪˋpit/  vt./vi. 重複 

Please repeat after me. 
請跟著我重複一遍。

The machine is repeating the same sentence all the time. 
那臺機器一直重複播放同一個句子。