看到这里，由于要考虑到级联结构，你可能感觉到规则书写变的有点复杂了，别急，歇一会吧，有工具可以帮助我们的，后边会提到。
With hierarchy considerations in mind, you may feel that rule writing is becoming a little complicated. Rest assured that there are tools that help out here, which will be introduced later.
最为一个办公或者家庭电脑的输入设备，你的键盘可能因为经常使用存积灰尘或者污垢，定期清理可以帮助我们的键盘看起来干净。
SOLUTION As with any office or home computer input device, your keyboard may collect dust or get dirty from regular use. Occasional cleaning will help keep the device looking clean.
你在火车站的出现可能帮助我们构建“第三只眼”，可以改善车站安全环境。
Your presence at a station can be very helpful to us as extra "eyes and ears" and can have a positive security benefit.
你也可以用一个问题来回答这个问题：“你可能在这个问题上可以帮助我。”
"You might answer the question with a question:" Perhaps you can help me on this one.
你也可以用一个问题来回答这个问题：“你可能在这个问题上可以帮助我。”
"You might answer the question with a question:" Perhaps you can help me on this one.
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