méi / yǒu / chǐ / zi / shí / kě / yǐ / ná / shéng / zi / bǐ / liang / mén / de / kuān / dù

没有尺子时，可以拿绳子比量门的宽度。

When you do not have a ruler, you can use a piece of string to roughly measure the width of the door.