back and forth motion 中文意思是什麼
back and forth motion
解釋
往復運動-
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。 -
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。 -
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。 -
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; -
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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