num. 八十, 八十个

◆记忆方法一：
联想方式：eigh-eight（8）＋ty-（跳跃）
8一跳跃就变80。
◆记忆方法二：
联想方式：eigh-eight（8）＋ty-（跳跃）
记忆方法：8一跳跃就变80。

eight/eighteen/eighty/height/weight
记忆：
1. eight [eIt] 八 The number eight is the favorite figure in China, for when pronounced it sounds like “fa”, meaning making large fortune. 在中国人们最喜欢的数字是八，因为念起来像“发”，即发财。
2. eighteen [5eI5ti:n] 十八 The girl at eighteen is as beautiful as a flower.十八岁的女孩美如花。
3. eighty [5eItI] 八十 Eighty as she is, she can speak quite fluently and clearly.虽然她年过八十，然而她言谈流利而清晰。
4. height [ hait ] n. 高度（high的名词）The helicopter stayed at the height of 50 meters.直升机停在五十米的空中。
5. weight [ weit ] n. 重力, 重量（weigh的名词） Vegetables are often sold by weight.蔬菜按重量卖。
另类阅读：
Eight helicopters stayed at the height of eighty meters with eighteen weights.