今日份单词：
1. hemisphere 半球
hemi 半 + sphere 「圆形物」
2. exceptional
adj. You use exceptional to describe someone or something that has a particular quality, usually a good quality, to an unusually high degree.优异的;非凡的adj. Exceptional situations and incidents are unusual and only likely to happen very infrequently.例外的;特殊的
3. recovery
n. If a sick person makes a recovery, he or she becomes well again.（身体的）恢复，康复
n. When there is a recovery in a country's economy, it improves.（经济的）复苏，好转
n. You talk about the recovery of something when you get it back after it has been lost or stolen.收回；取回；失而复得
n. You talk about the recovery of someone's physical or mental state when they return to this state.（身体或精神状态的）恢复
phrase. If someone is in recovery, they are being given a course of treatment to help them recover from something such as a drug habit or mental illness.在恢复当中；正在好转
4. characteristic
n. The characteristics of a person or thing are the qualities or features that belong to them and make them recognizable.特色;特点;特征
adj. A quality or feature that is characteristic of someone or something is one which is often seen in them and seems typical of them.(品质、特点)明显的，显著的，典型的
5. conventional
adj. Someone who is conventional has behaviour or opinions that are ordinary and normal.（行为、观念等）传统的，符合习俗的
adj. A conventional method or product is one that is usually used or that has been in use for a long time.（方法或产品）通常的，传统的
adj. Conventional weapons and wars do not involve nuclear explosives.(武器、战争等)常规的，非核的
6. disastrous
adj. A disastrous event has extremely bad consequences and effects.极糟糕的;灾难性的adj. If you describe something as disastrous, you mean that it was very unsuccessful.完全失败的;极糟的
7. hypothesis
n. A hypothesis is an idea which is suggested as a possible explanation for a particular situation or condition, but which has not yet been proved to be correct.假说;假设
8. devote
v. If you devote yourself, your time, or your energy to something, you spend all or most of your time or energy on it.献（身）；奉献，投入(时间、精力等)
v. If you devote a particular proportion of a piece of writing or a speech to a particular subject, you deal with the subject in that amount of space or time.将(文章或讲话的某一部分)专用（于）
9. distinct
adj. If something is distinct from something else of the same type, it is different or separate from it.有区别的;不同的;个别的
adj. If something is distinct, you can hear, see, or taste it clearly.清楚的;清晰的;明显的adj. If an idea, thought, or intention is distinct, it is clear and definite.确定无疑的;确切的;清楚的
adj. You can use distinct to emphasize that something is great enough in amount or degree to be noticeable or important.显著的;明显的
prep. If you say that you are talking about one thing as distinct from another, you are indicating exactly which thing you mean.截然不同于;完全不同于;有区别于
