例句：
How can I be of assistance to you today?
今天我能为您做些什么？
The value of this kind of assistance is fiercely debated.
对这种协助的价值存在很多质疑。
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.