用作定语
▲～+n.
Operational research is a newly emerging subject.运筹学是一门新兴的学科。
You have to remember those operational symbols.你必须记住那些运算符号。
用作表语
▲S+be+～
The airport did not become operational until May.机场到五月才可使用。
The new machines are not yet operational.那些新机器还未能正常运转。
