Find yourself a wooden spoon and stick a line on it, about a centimetre and a half.

找一根木勺，在上面画一条线，大约一点五厘米。

You can do this by learning a set number of lines of poetry at different times of the day, and see when most lines stick.

你可以在不同的时间段背诵诗，看哪个时间段你背的最牢。