He would use tracing paper to allow him to create multiple images from the same drawing.

他会用描图纸将同一幅画绘制成多个图。

Tracing paper, toilet roll is a liberty.

描图纸、厕纸，这直是放肆。

You know it's your flatmate's turn to buy the toilet roll when they get the cheapest, nastiest, budget toilet roll that could be used as tracing paper.

你知道该轮到室友买厕纸的时候，他们会买最便宜、最粗、算纸一样的厕纸，那东西直可以当描图纸用了。

You know it's your flatmate's turn to buy the toilet roll when they get the cheapest, nastiest, budget toilet roll that can be used as tracing paper.

你知道该轮到你的室友买厕纸了，因为他们会买最便宜、最粗、算纸一样的厕纸，那玩意儿都能当描图纸用了。