用 Ⅰ動詞1.(使用) use; employ; apply 用火烤 bake over the fire; 用石頭鋪路 pave a road with stone; 用手掰 break with one's hands; 用水煮 boil in water; 用針刺麻醉做外科手術 employ acupuncture anaesthesia in surgery; 用我們自己的雙手來重建家園 rehabilitate our homeland with our own hands; 用 40分鐘跑完全程 run the course in 40 minutes; 那筆錢被用來還債了。 the money was applied to the payment of debts. 你會用筷子嗎? do you know how to use chopsticks? 麝香被用作香料和興奮劑。 musk is used for perfumes and stimulant. 這個詞用得不對。 this word is wrongly used. 這些會議全用世界語進行。 these meetings are carried on entirely in esperanto. 這種鳥用嘴作武器。 this bird employs its beak as a weapon.2.(多用于否定: 需要) need 不用開燈。 there's no need to turn on the light. 我看你一點也不用著急。 i don't think you need to worry in the least.3.(敬辭: 吃; 喝) eat; drink 請用茶。 won't you have some tea, please? 請用飯! please help yourself (to rice, etc.).Ⅱ名詞1.(費用) expenses; outlay 家用 family [domestic] expenses; 零用錢 pocket [spending] money; 日用 daily expenses; 省吃儉用 save money on food and expenses2.(用處) usefulness; use 沒用 useless; worthless; 所學非所用 a person's education does not fit him for a certain job; 物盡其用 make the best use of everything; 有點用 be of some use; 它是極有用的。 it is of the greatest usefulness.3.(姓氏) a surname 用虬 yong qiuⅢ連詞[書面語] (因此;因為) hence; therefore 用特函達。 hence this letter
和 和動詞(在粉狀物中加液體攪拌或揉弄使有黏性) mix (powder) with water, etc.: 和點兒灰泥 prepare some plaster
Compare problems 2 & 3 with problem 1 . what parts are known in problems 2 & 3 ? and what are we trying to find out ? please discuss with your partners 讓學生討論后,說出:第( 1 )題是已知兩個加數,求它們的和,用加法計算。第( 2 ) 、 ( 3 )題是已知兩個數的和與其中的一個加數,求另一個加數,用減法計算。