dyn,dynamo來源于希臘語的dynames,意為"power"。
1.dynamic
adj.forceful,having a lot of energy;of physical power and forces;producing motion精力充沛的；充滿活力的；動力的 *dyn (=power)
例句：Bollinger construction ,a dynamic Brazilian contractor,is aggressively pursuing the deal.一個充滿活力巴西承包商——寶靈戈建筑公司，也正在角逐這項合同，且很競爭力。
2.dynamite
n.powerful explosive used in mining and quarrying;any person or thing having a spectacular effect 炸藥；會引起轟動的人或物 *dyn(=power)
例句：Dynamite was used to clear the fallen rocks quickly.炸藥曾被用于快速清理落下的巖石。
3.dynamo
n.machine for converting mechanical energy to electrical energy;an energetic person 發(fā)電機；精力旺盛的人 *dyn (=power)
例句：Fortunately,I have a real dynamo for a secretary.很幸運我有一個精力旺盛的秘書。
4.dynasty
n.succession of rulers belonging to one family 王朝 *dyn(=power)
例句：The dynasty was short-lived though,lasting only to Myhari's great grandson's succession to the throne in 1463.但是，這個王朝壽命很短，只維持到1463年馬哈里的曾孫登上王位。