衍生词
summary
adj. 简易的；扼要的
n. 概要，摘要
词语扩展：
①summon up
鼓起勇气，奋起，唤起
②summon sth up
集拢、聚集、征集
③summon the courage to do
④召唤;召来
(常与 away, to 或 from连用)：
例句:
He summoned his subordinates hastily to his office.
他急忙召唤他的下级去他的办公室商议。
He was summoned to the White House.
