例句與造句

1. While gravel does require some extra maintenance _ it needs to be raked once a year and occasionally weeded in areas of low traffic; it also needs a refresher coat of stone every four or five years _ this little bit of labor is more than offset both by gravel's good looks and, even more importantly, by its lower installation cost : The average gravel drive is generally half as expensive as hard paving.
2. It's difficult to find refresher coat in a sentence. 用refresher coat造句挺難的