n an urgent or peremptory request
n the ability and desire to purchase goods and services
n required activity
n the act of demanding
n a condition requiring relief
v request urgently and forcefully
v require as useful, just, or proper
v claim as due or just
v lay legal claim to
v summon to court
v ask to be informed of
v. 要求( demand的第三人称单数 ); 需要; 想要知道; 查问