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helpful /ˋhɛlpfəl/  adj. 有益的 

This is the only book that is helpful for my project in the entire library. 
這是整間圖書館唯一一本對我的報告有益的書。

knee /ni/  n.[C] 膝蓋 

He asked Mary for marriage on his knees. 
他跪下跟瑪莉求婚。

He fell off the bicycle and hurt his knees. 
他從腳踏車上跌下來，弄傷了膝蓋。

My knees were hurt in a car accident. 
我的膝蓋在一次車禍中受了傷。

roll /rol/  vt./vi. 滾動 

The ball rolls down from the stairs. 
那顆球從樓梯上滾下。


shopkeeper /ˋʃɑp͵kipɚ/  n. [C] 店長 

The shopkeeper in this shop is nice. They have products on sale every day. 
這家店的店主人很好。他們每天都有特價商品。


umbrella /ʌmˋbrɛlə/  n.[C] 雨傘 

The little boy is running on the street in the rain without an umbrella. 
小男孩沒撐傘冒雨在街上奔跑。