To perform in or as if in a play; dramatize
在行动中实现，付诸行动
act out a story.
连说带比划地讲将故事
wanted to act out his theory.
想在行动中实践他的理论
To express (unconscious impulses, for example) in an overt manner without awareness or understanding.
冲动行事：不知不觉中公开地表示（例如，无意识的冲动）
To misbehave.
行为不良
To malfunction.
发生故障
&I{Informal} To become active or troublesome after a period of quiescence
【非正式用语】 疾病发作：一段时间的平静之后变得活跃或令人讨厌
My left knee acts up in damp weather. Her arthritis is acting up again.
我的左膝一到阴湿天气就犯病。她的关节炎又犯了
an instance of uncontrollable natural forces in operation (often used in insurance claims)
[常用于保险索赔]不可抗力
a privilege or concession that cannot be claimed as a right
恩典，大赦令
(一般作 be caught in the act)surprise someone in the process of doing something wrong
当场抓住（或发现）某人做坏事
the thieves were caught in the act.
窃贼们被当场抓住。
behave in a more acceptable manner
改进举止
(informal)galvanize oneself into organizing one's life or affairs effectively
(非正式)（使自己的生活处事）有头绪；有条有理地行事
(informal)become or be involved in a particular activity, in order to gain profit or advantage
(非正式)（为获得利益或有利条件而）加入（或参与）（活动），插一手
an achievement or performance which sets a standard regarded as being hard for others to measure up to
难以取得的成就（或成绩）
in the process of
在…过程中
they photographed him in the act of reading other people's mail.
他们拍下了他私看他人信件的行为过程。
To be included in an activity.
参与：参加行动
To improve one's behavior or performance.
改进举止：改进某人的举止或表现
To insert oneself into an ongoing activity, project, or situation.
加入，参与：中途加入到进行中的活动、项目或形势
To get organized.
组织起来，有头绪