用户验证—已经搞定！
Note: There's a gotcha that often pops up, so even though it's a lower-level detail, I'm going to mention it here.
注意：有个经常出错的问题，即便它是一个底层的细节，我也要在这提一提。
Although this Groovy shortcut syntax for Maps is undeniably cool, it is also the source of a common gotcha when you use reflection on Maps.
不可否认，Groovy针对Map的这种便捷语法非常酷，但这也是在对Map使用反射时引起一些常见问题的原因。
The container manager said that when his team came and told him what had happened, he was looking around for cameras to see if it was a 'gotcha' hoax.
那公司的集装箱经理说当他的团队告诉他发生了什么事情之后，他环顾四周看看哪里有相机，以为这是个恶作剧。
In general, the AD hoc id values will not matter to a program, but with the use of things like cryptographic hashes or CRCs as part of a process, this could be a "gotcha."
一般来说，特定的id值对于程序没有什么影响，但使用象密码散列或CRC这样的事物作为进程一部分的话，这就会是一个“陷阱”。
Planning is the big “gotcha” for lots of people — we might have a big general plan, but when it comes time to sit down and actually do something, we have no idea what to do.
计划是很多人的“痛脚”——我们也许有个笼统的框架，但到了该坐下来做些什么的时候，我们却不晓得该干什么。
Gotcha 3: Managing external volume groups.
陷阱3：管理外部卷组。
我这下可抓住你了吧？
In the spring of 1987, I was watching a locally produced television program called "Gotcha Chicago."
1987年春天，我正在看当地的电视节目《哈哈芝加哥》。
In the spring of 1987, I was watching a locally produced television program called "Gotcha Chicago."
1987年春天，我正在看当地的电视节目《哈哈芝加哥》。
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