我们收到了一条短信，通知会议取消了。

We received a ___text informing us that the meeting was canceled.

谢天谢地，航班没有取消！

___Thank God the flight wasn't canceled!

导游带我们参观了这座古城的所有著名景点。

The ___tour guide took us to all the famous landmarks in this ancient city.

在几何问题中，我们需要找到曲线在某一点的切线方程。

In geometry problems, we need to find the equation of the ___tangent at a given point on the curve.