A lump the size of a tennis ball.

Experimental Simulation Based on the Reciprocity of Tennis Ball and Oscillatory Table-board

基于网球与台面相互作用的虚拟实验仿真

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An analysis on relationship between velocity of tennis ball and string tension of tennis racket

关于网球拍弦张力与击球速度关系的分析

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All the kinetic energy is in the tennis ball; nothing is in the wall.

也就是网球的动能；，墙壁没有动能。

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Squeeze a tennis ball in your hand to relieve stress and increase hand strength.

手里紧握一个网球，缓解压力，增加手的力量。

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There is air drag on that tennis ball.

网球受到空气阻力。

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The stones should be about the size of a tennis ball.

收集的石头大约像网球那么大。

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The Practice and Research of "5+ 11 Min" Simulation Training Method of University Tennis Ball

球形半导体技术高校网球5+11Min模拟教学法实践与研究

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A hard return hitting the tennis ball above your head.

在你的头顶上用力地击球。

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So, look at the tennis ball first.

首先，看网球。

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The Study on Cultivation of Ability for Controlling Ball in Tennis Ball Teaching

试析网球教学中对学生控球能力的培养

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Research on the Present Situation and Strategies of Consumption of Tennis Ball in Chengdu

成都市网球消费现状及对策研究

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He spent hours throwing a tennis ball against a wall

他好几个小时都对着一堵墙掷网球。

柯林斯高阶英汉双解学习词典

For he said unto him, Come out of the man, thou unclean spirit.

是因耶稣曾吩咐他说：污鬼啊，从这人身上出来吧！

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The first time congress dealt with any issue pertaining to unclean air was in 1955.

国会处理关于空气污染的问题始于1955年。

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Unclean animals were not made to be our food, so must not be eaten.

不洁净的动物不是人的食物，故不可吃。

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He is not to put him in isolation, because he is already unclean.

祭司要定他为不洁净，不用将他关锁，因为他是不洁净了。

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To make impure or unclean by contact or mixture.

污染通过接触或混合使…不纯净或不洁净已评

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The one who touches any such thing will be unclean till evening.

摸了这些人，物的，必不洁净到晚上。

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That means God sees everyone as sinners, as unclean.

这就意味着神看每个人都是罪人，是不洁净的。

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You see, you washed the car, but left the windows unclean.

你看，你洗了汽车，但是没有把窗子擦干净。

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