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

他用描图纸将同一幅画多个图像。

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.

知道该轮到的室友厕纸了，因为他最便宜、最粗糙、像预算纸一样的厕纸，那玩意儿都能当描图纸用了。

Tracing paper, toilet roll is a liberty.

描图纸、厕纸，这简直是放肆。

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.

知道该轮到室友厕纸的时候，他最便宜、最粗糙、像预算纸一样的厕纸，那东西简直可以当描图纸用了。