“缺乏动力”常见的英文表达有 “lack motivation” 或 “be short of motivation”，也可用 “be unmotivated”。以下为具体例句：
* Lack motivation
* I've been lacking motivation to exercise lately.（最近我一直缺乏锻炼的动力。）
* Many students lack motivation to study because they don't see the immediate benefits.（许多学生缺乏学习的动力，因为他们看不到即时的益处。）
* Be short of motivation
* He's been short of motivation at work recently.（他最近工作上一直缺乏动力。）
* The team seems to be short of motivation after several consecutive losses.（在连续输掉几场比赛后，这支队伍似乎缺乏动力。）
* Be unmotivated
* She feels unmotivated to finish the project on time.（她觉得没有动力按时完成这个项目。）
* When people are unmotivated, they tend to procrastinate.（当人们缺乏动力时，他们往往会拖延。）