请问with在句中的作用

问题描述:

请问with在句中的作用
The distinguishing feature of a fluid,in contrast to a solid,is the ease with which a fluid may be
请问为什么在句中要加上with?

with 是一个介词,在句中引导了一个定语从句,是词组with ease要求的.
with ease 轻松自如地