a. performing or able to perform its regular function
n. 运行, 运作;功能;机能;起酌(function的动名词)
1. The machine is not functioning properly right now.
这台机器现在运转不正常。
2. She is functioning well under pressure.
她在压力下表现得很好。
3. We need to ensure that the system is functioning as expected.
我们需要确保系统按预期运作。