back and forth motion 中文意思是什麼

back and forth motion 解釋
往復運動
  • back : n 1 背，背部；背脊；背面，反面；背後，後部，後面，裏面。2 （指）甲；（刀）背；（手）背；（書）背...
  • and : n. 1. 附加條件。2. 〈常 pl. 〉附加細節。
  • forth : adv. 1. 向前，向前方。2. 以後。3. 向外，由隱而顯。〈古語〉出於，來自。 go forth the house 從屋裡出去。
  • motion : n 1 運動 動 移動（opp rest）。2 （天體的）運行；（車、船等的）動搖；（機器的）開動 運轉；【機械工...
  1. When sound waves enter the cochlea, which is really a tube coiled around, they set a membrane into a back and forth motion and cause a new wave

    當聲波進入耳蝸這條盤旋的管道，它令薄膜前後移動並且產生新的波動。
  2. To work out a mathematical relationship of the “ dopplereffect ” ， relating the pitch to the relative motion of source andobserver ， the austrian scientist christian johann doppler placedtrumpeters on a railroad flat car and musicians with a sense ofabsolute pitch near the tracks. a locomotive engine pulled theflat car back and forth at different speeds for two days. themusicians on the ground “ recorded ” the trumpet notes as the trainapproached and as it receded

    為了計算出「多普勒效應」的一個數學關系，即音調和運動中的聲源和觀察者之間的相對關系，奧地利科學家克里斯蒂?約翰?多普勒讓幾位吹號人坐在一節平板火車上，讓幾個對音調特別敏感的音樂家坐在鐵軌附近。
  3. The classical analog of this state of motion is a straight-line trajectory back and forth through the nucleus.

    這個運動狀態的經典對應，是通過原子核來回運動的直線軌道。
  4. Hold the floss tightly between the thumbs and forefingers of both hands, leaving about 2 cm of floss in between. use a back and forth motion to gently slide the floss towards the gingivae between the teeth

    用雙手的拇指及食指操縱一段約2厘米長的牙線，前後拉動牙線並慢慢地讓它滑進牙縫內；
  5. Brush the teeth everyday with fluoride toothpaste in the morning and before going to bed at night. removable dentures should be taken out before teeth brushing. place the soft - bristled toothbrush against the gum margin and gently brush in a back - and - forth motion along the outer surfaces and inner surface

    早晚用含氟牙膏，徹底清潔牙齒，如配戴牙托者，清潔牙齒前先將牙托取下，再選用細刷頭和刷毛軟硬中等的牙刷來清潔牙齒，將牙刷斜放在牙面與牙肉之間，這樣就可以連牙頸的地方都刷到。
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