口诀用了简单的韵律和短语来帮助记忆事情。许多孩子在学校的前几年都会学习。

Mnemonics are simple rhymes or phrases used to help remember things. Many are taught to children during early school years.

How Many Days in Each Month

30 days has September,
April, June, and November.
All the rest have 31,
But February, which has 28 alone
Except in a leap year, that’s the time
When February’s days are 29.

(30 days: April, June, September, November
31 days: January, March, May, July, August, October, December
28 or 29 days: February)

The Order of Colours in the Rainbow

Richard Of York Gave Battle in Vain
(red, orange, yellow, green, blue, indigo, violet)

The Order of the Original Nine Planets

My Very Easy Method: Just Set Up Nine Planets
(Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto)

The Order of Notes When Reading Music

(The lines) Every Good Boy Deserves Favours
(E, G, B, D, F)

(The spaces) FACE
(F, A, C, E)

The Order of British Ruling Families (Royal Houses)

No Plan Like Yours To Study Oral History So Wisely
(Norman, Angevin, Plantagenet, Lancaster, York, Tudor, Stuart, Orange, Hanover, Saxe-Coburg, Windsor)

Note: these are the ruling families since England was united. It does not include earlier kings, or consider monarchy from Scotland or Wales.

Order of Some Major Chinese Dynasties

Quit Hanging Suits Tangled, Some Men Mind Quietly
(Qin, Han, Sui, Tang, Song, Mongol, Ming, Qing)

Notes: this does not include every dynasty, just some of the more famous ones. The Mongol dynasty was also officially the ‘Yuan Dynasty’.

Compass Points

Never Eat Shredded Wheat
(North, East, South, West)
* Shredded Wheat is a breakfast cereal

NEWS
(North, East, West, South)

Spelling Rules

i before e, except after c
(field; yield; ceiling)

desert or dessert: the sweet one has two sugars
(dessert is the sweet food)