Some of my friends develop their arm muscles by playing tennis.
我的一些朋友通过打网球锻炼他们胳膊的肌肉。
Here's a simple tip that will help you master this shot: Practice hitting low volleys with a tennis ball placed under your hitting arm.
这里有一个小窍门帮助你掌握这种击球方法：夹一个网球在你击球胳膊的腋下来练习低位截击。
Jim hurt his arm (while) playing tennis.
吉姆打网球时手臂受了伤。
Jim hurt his arm while [when, as] he was playing tennis.
吉姆打网球时把手臂扭伤了。
With a tennis ball under your hitting arm, you'll be forced to hold the racquet out in front of you and use proper technique.
夹一个网球在你击球胳膊的腋下，会强迫你保持拍头在你体前并使用更合理的技术。
She broke ber arm while playing tennis yesterday.
她昨天打网球时跌断了手臂。
I pulled a muscle in my arm and can't play tennis today.
我拉伤了手臂的肌肉，今天没办法打网球了。
She reaches her arm behind her head as if to throw the tennis ball in her hand.
她把手臂弯到头后，就像要把手中的网球抛出去。
He hurt his arm playing tennis.
他打网球伤了手臂。
I continue to raise the tennis racket until my tennis racket and hitting arm look like an "L."
我继续上举球拍直到我的球拍和击球手臂看起来像“L”型，在录像37秒中清楚显示。
I continue to raise the tennis racket until my tennis racket and hitting arm look like an "L."
我继续上举球拍直到我的球拍和击球手臂看起来像“L”型，在录像37秒中清楚显示。
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