assistance的搭配用法？

　　例句：

　　How can I be of assistance to you today?

　　今天我能為您做些什么？

　　The value of this kind of assistance is fiercely debated.

　　對這種協(xié)助的價值存在很多質(zhì)疑。

　　He can walk only with the assistance of crutches.

　　他只能靠一副拐杖走路。

　　The customer is choosing a computer with the assistance of the salesperson.

　　顧客在售貨員的協(xié)助下正在選擇計算機。