Most people will tell you that without a cup of coffee in the morning, they cannot function.

大部分人会告诉你，如果早上不喝一杯咖啡，他们就活动不起来。

youdao

They say the United Nations complex humanitarian operation in this conflict-ridden province cannot function efficiently without their help.

VOA: standard.2009.03.28

"They realised that they cannot function as before with impunity and profits are no longer good, " he said.

BBC: Somali pirate 'Big Mouth' quits

We have to have impartial panels of professional police because without that and without the trust of the general public, they cannot function.

NPR: Iraqi Envoy Reflects on Study Group's Report

Call me crazy but leaders cannot function on a global scale if they worry about every single tiny detail in the business.

FORBES: The Balance Between Leadership and Accountability