cancel是什么意思？

Its negative effects more than cancel out its positive effects.

But doesn't the extra money in the pockets of those countries' consumers mean an equal loss in oil-producing countries, cancelling out the gains? Not necessarily, says economic researcher Sara Johnson.

Goldman Sachs, an investment bank, cancelled a conference in Las Vegas at the last minute and rebooked it in San Francisco, which cost more but sounded less fun.

Goldman Sachs, an investment bank, cancelled a conference in Las Vegas in order to avoid seeming wasteful

Why does the author plan to cancel his Facebook account?

Cancel the contract with the customer.

Cancel the trip to prepare for the test.