Both opposition parties are criticizing the four-day working week as an empty promise that will never be enacted.两个反对党都在批评每周工作四天是一个永远不会实现的空头承诺。He was just stringing us along with false promises.他只是在用空头承诺不断地哄骗我们。There is an element of 'jam tomorrow' about some of the government's policies.政府的有些政策有点像美好的空头许诺。