如果管道要联接到法兰上，必须以直线方向安装到法兰上，避免由于没有对准而对法兰产生压力。
Piping runs joined to the flanges must be installed in a straight line position to the flange to avoid stress at the flange due to misalignment.
比方说当我们思考将咒语对准某物的机械原理时会问“麻瓜”问题（即巫师不会问的问题）像“你是否必须将视线呈一直线？”
When we consider the mechanics of, say, aiming a spell at something, we ask "muggle" questions like "Do you have to have line of sight?" that they would never think to ask.
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