Unit 90

compound / propound / expound

compound v. 混合，合成 (to form by combining separate things) /ˈkɒmpaʊnd/

Concrete can be compounded by combining sand, gravel and other aggregates with a liquid cement.

propound v. 提出…供考虑 (to offer for discussion or consideration) /prəˈpaʊnd/

The scientist propounded his hypothesis at several conferences in order to disseminate the idea.

expound v. 解释，详细说明 (to explain by setting forth in careful and often elaborate detail) /ɪkˈspaʊnd/

The scientist did his best to explain his hypothesis by expounding on it in careful detail.

virtual adj. 实际上的 (very close to being something without actually being it) /ˈvəːtjʊəl/

Synthetic diamonds are virtual copies of natural diamonds, but they are created in laboratories.

adj. 虚拟的 (existing or occurring on computers or on the Internet)

Frank spent so much time playing computer games that his virtual life was much more interesting than his physical one.

virtue n. 优点，美德 (morally good behavior or character) /ˈvəːtʃuː/

There is an English language aphorism stating that the virtue of good behavior is its own reward.

petty adj. 不重要的 (not very important or serious) /ˈpɛti/

Nalini always kept a small amount of petty cash on hand in case of an emergency.

pity n. 怜悯，同情 (a strong feeling of sadness or sympathy for someone or something) /ˈpɪti/

We felt a great deal of pity for the lost child and did our best to help her find her parents.

pretty adj. 漂亮的 (attractive to look at, usually in a simple or delicate way) /ˈprɪti/

With her long blonde hair, green eyes and pink lips, Jennifer Lawrence is among the prettiest actresses working today.

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