1.nutrition n.营养(the act or process of nourishing or being nourished)
词根记忆：nutri(营养)+tion--营养
例：A balanced diet is important in nutrition.
派生词：nutritional(a．营养的，滋养的)
同根词：nutritious(a．富含营养的)：nutrient(n.营养品：a．滋养的)
2.nutritious a．有营养成分的，营养的( nourishing)
词根记忆：来自nutrition(n.营养)
例：The milk of mammals would be less nutritious if it did not contain cannabinoids.
派生词：nutritiousness(n.有营养成分)
同根词：nutrient(n．营养物：a．营养的)
3.oats n.燕麦(a crop or plot of the oat)；燕麦片(oatmeal)
发音记忆：“饿吃”--饿了吃燕麦
注意：oatmeal(n．燕麦粥)
例：A breakfast cereal contains oats, raisins and nuts.
4.obese a．肥胖的(having excessive body fat)
发音记忆：“藕必是”--藕必是圆圆的--肥胖的
例：Many people become obese more due to the fact that their bodies burn calories too slowly than overeating.
派生词：obesity(n.肥胖)
5.objection n.厌恶，反对(dislike or disapproval)
词根记忆：ob(倒逆)+ject(投掷)+ion--反着投--反对
例：This objection was reasonable when only early theropod clavicles had been discovered.
同根词：objective(n．目的：a．客观的)
6.objective a．季观的(external);n．目标，目的(aim, goal)
和object(n．目标)一起记
例：objective criteria客观标准// political objective政治目标
派生词：objectivity(n.客观性)
7.oblique a．斜的，倾斜的(inclined)
词根记忆：ob(躺)+lique(离开)--躺着都能滑开--斜的
例：an oblique angle斜角（包括锐角和钝角）
8.obscure a．模糊的(faint, undefined)；v.使…不明显(to make dim)
联想记忆：ob(离开)+scure（跑）--越跑越远渐渐地就看不清楚了--使…不明显
例：Clark believes the possibility has been obscured by the recent sociological fashion.
9.observation n.观测(an act of recognizing and noting a fact or occurrence); 遵守(an act or instance of observing a custom, rule, or law);观察报告(a record or description so obtained)
词根记忆：来自observe(v.观察：遵守)
例：The first is an observation that the editorial disputes.
派生词：observational(a．观测的)
同根词：deserve(v.应受，应得)