He brought his arm up in a futile attempt to ward off the blow.

他出于挡住这一击的无谓企图抬起了他的胳膊。

《柯林斯英汉双解大词典》

She raised her arm up to fend branches from her eyes.

她抬起胳膊将树枝从她眼前挡开。

youdao

Exhale raise the left arm up into this variation of Reverse Extended Side Angle.

呼气，抬左臂向上进入扭转侧三角伸展式。

youdao

This huge warrior threw me to the ground and then took hold of my arm again to pick me up.

VOA: special.2010.07.17

If you sit in your chairs and look at this keyboard, and relax your muscles and imagine moving your right arm up and hitting the "s" key.

当你坐在椅子上，注视着电脑键盘，放松肌肉,想象你抬起右臂敲击，S，键。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

What this does then is it paralyzes you because your motor neurons-- You send the command to your arm to stand, to lift up.

结果就是它能使你瘫痪,因为你的运动神经元,你想要举起手臂

耶鲁公开课 - 心理学导论课程节选

Another man who appeared to be a teacher held his arm up and shouted, "5th graders!"

CNN: Heartbreaking scenes in Oklahoma City area after twister

Now when he gets a call Prideaux can either hold the prosthetic arm up to his ear, put it on speaker phone, or take it out if need be.

FORBES: Man Installs Nokia Phone In His Prosthetic Arm

Colonel STEVE WILLIAMS (Deputy Commander, NATO): You've got these caves and these systems that these guys can in and cache weapons systems and then find other ways to come across the border, go to these cache sites and arm up.

NPR: NATO Beats Taliban in Battle, Works to Win War