operate the brakes of a vehicle suddenly and forcibly, typically in response to an emergency
緊急剎車
(Brit.)a pleasant thing which is often promised but rarely materializes
(英)允諾而做不到的好事；可望而不可即的事物
a promise of jam tomorrow wasn't enough to satisfy them.
口惠而實不至的諾言難以令他們滿意。