为了配合曲线轮廓，必须切削每块木瓦，这减慢了我的进度。
Having to custom cut each shingle to match the contour of the curves slowed my progress.
使用的刀具外形必须正好与要切削螺纹的轮廓一致，即三角形刀具必须用于三角形螺纹等等。
The form of the tool used must exactly coincide with the profile of the thread to be cut, i. e. , triangular tools must be used for triangular threads, and so on.
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