step up在有需要（或有机会）时采取行动。to take action when there is a need or opportunity for it
step up增加。如step up production增加生产。
【例句】
Investors have to step up and assume more responsibility for their assets.
投资者必须采取行动，为他们的投资承担更多责任。
I hope you try to get them to step up production.
希望你们尽力使厂家增加生产。
【例句】
Investors have to step up and assume more responsibility for their assets.
投资者必须采取行动，为他们的投资承担更多责任。
I hope you try to get them to step up production.
希望你们尽力使厂家增加生产。
