expectation
n.期待，预期;[ pl.]前程，成功的前景
Having raised expectations(=made people more hopeful), he went on to help only a few people.
由于唤起了希望，他继续帮助了几个人。
expend
vt.花费，消费，消耗
Manufacturers have expended a lot of time and effort trying to improve computer security.
制造商花费了大量的时间和精力试图提高计算机的安全性。
expense
n.价钱，花费，费;[ pl.]开支，业务费用
The council must now decide whether to go to the expense of appealing through the courts.地方议会现在必须决定是否花钱通过法院进行上诉。
expert
n.专家，能手 a.专家的，内行的，熟练的
He’s a world expert on marine mammals.他是研究海洋哺乳动物方面的世界性权威。
