在开学的第一天，苏格拉底告诉他的学生：“今天，我们只学一件事情。那就是前后摆动你的手臂。”
On the first day of school, Socrates told his students, "Today, we'll only learn one thing. That is to swing your arm forward and backward."
刷毛尖端应该保持在一个位置，但是刷头前后摆动。
The tips of the bristles should stay in one place, but the head of the brush should wiggle back and forth.
同时，双臂略弯曲，像走路一样有节奏地前后摆动。
At the same time, two arms curving slightly, swinging forward and backward rhythmically like walking.
妈妈唱着催眠曲，而我的小妹妹在摇篮里轻柔的前后摆动。
Mom was singing a lullaby to my baby sister while rocking the cradle with a gentle backwards and forwards.
这些动词所共有的中心意思是。大胆而有戏剧性的前后摆动。
The central meaning shared by these verbs is . to swing back and forth boldly and dramatically.
前后摆动沿一条飞行路线来回摇摆，似乎在寻找一个新的方向或进攻角度。
To yaw back and forth about a flight path as if seeking a new direction or another Angle of attack. used of an aircraft a rocket or a space vehicle.
前后摆动：沿一条飞行路线来回摇摆，似乎在寻找一个新的方向或进攻角度。
To yaw back and forth about a flight path, as if seeking a new direction or another angle of attack. Used of an aircraft, a rocket, or a space vehicle.
向前看(不是向下)，保持你的肩膀放松，手臂前后摆动(不要左右摆动)，手轻轻握紧。
Look ahead (not down), keep your shoulders relaxed, arms swinging back and forth (not side to side), and your hands gently clenched.
您应该肘部弯转90度，双臂前后摆动(旋转，以肩部为中心)，而不是左右摆动。
Your arms should be at a 90 degree Angle and should be moving forward and back (rotating at the shoulder), not side to side.
这一数据反应出主恒星受该行星重力影响而前后摆动的程度，据此他们计算出了两者的质量。
This data showed how the star nodded back and forth in response to the planet's gravity, allowing the team to calculate the masses of both objects.
整个谷仓里唯一的声音就是从屋顶传来的缕轻微的刮擦声，那儿有天气风向标在前后摆动。
The only sound was a slight scraping noise from the rooftop, where the weather-vane swung back and forth.
他稀疏的头发几乎全白了，下巴上几绺长长的灰白的胡子，还随着窗口吹进来的风滑稽地前后摆动。
His sparse hair was almost white, and from his chin dripped a long smoke-coloured beard, which waved absurdly back and forth, fanned by the breeze coming in at the window.
使用方法：双手紧握把手，双脚放在脚踏板上，两脚前后交替自然摆动，进行漫步动作。
Use Method: hold the handle, step on the pedal, and the teo legs swing naturally as walking.
在能量分析的基础上，给出了一次摆动的前后角度边界和一次摆动时间最短轨迹的解析分析。
Forward and backward Angle bound of a swing and the fast swing track are presented based on energy analysis.
在能量分析的基础上，给出了一次摆动的前后角度边界和一次摆动时间最短轨迹的解析分析。
Forward and backward Angle bound of a swing and the fast swing track are presented based on energy analysis.
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