Also, the UML 1.x notation set was at times difficult to apply to larger applications.
同时，UML 1. x符号集合有时难以适用于较大的应用程序。
Learning a new programming language can be a daunting task and at times difficult to know where to start.
学习一门新语言很容易让人焦躁，人们也往往不知从何处开始着手。
The auditor faces difficult problems and often times difficult people, while maintaining the cool calmness that comes with experience and self-confidence.
内审工作经常面临难题，经常要面对一些难以相处的人，而同时又要保持冷静，这种冷静来自经验和自信。
Our first meeting in 1984 marked the beginning of a relationship that was at times difficult, not always smooth, but was treated seriously and responsibly by both sides.
我们在1984年第一次会面，随后便开启了一段时而棘手、并非一帆风顺但双方都认真负责予以对待的关系。
You are going to face hard times, difficult decisions and possibly even failure at some point.
你总会在某些时候，面临困境，作出艰难抉择，甚至可能会经历失败。
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