1. The runners flexed their muscles as the preparatory activities for the race.
    赛跑选手们伸屈四肢，放松肌肉以此作为比赛前的准备活动。

1. 屈：轴向压缩(A.C)、前屈(Flex)、后伸(Ext)和左右侧屈(L.B)4种工况下加载,应变变化为TSRH固定平均应变A点比正常组小17%,B点平均小15%;Zplate固定平均应变A点比正常组小24%,B点平均小22%.

2. 柔体：-增强的柔体(Flex)支持多种软体动力学效果如真实的动力学中的碰撞检测. -新扩展的IK体系结构具有可互换的解算器,使得为制作效果选择合适的解算器变得更容易. -历史无关和历史相关及肢体结算器都可以通过插件来增强功能.

3. 911查询·英语单词

3. 挠曲：NIST 已为这款弹性记忆装置申请了专利(application #12/341.059)能够挠曲(flex)而不会破裂的电子元件,因许多理由 -- 而且不只是因为人们有抛弃其 mp3 播放器的倾向 -- 为可携式装置制造商所梦寐以求.

4. 修改：这个概念名词我好象不知的,只知道变形修改动力学弹力,弹簧,空间扭曲,松驰修改(FLEX)之类的可以让物体运动起来变形......

5. flex：frequency level expander; 频率扩展器

6. flex在线翻译

6. flex：flexible; 挠性

1. (电器用)花线，皮线
    A flex is an electric cable containing two or more wires that is connected to an electrical appliance.

2. 活动，屈伸(肌肉或身体某一部分)
    If you flex your muscles or parts of your body, you bend, move, or stretch them for a short time in order to exercise them.

    e.g. He slowly flexed his muscles and tried to stand.
           他缓慢地活动了一下肌肉，想尽量站起来。

3. to flex your muscles -> see muscle

1. the act of flexing

    e.g. he gave his biceps a flex to impress the ladies

1. cause (a plastic object) to assume a crooked or angular form

    e.g. bend the rod
           twist the dough into a braid
           the strong man could turn an iron bar

    Synonym: benddeformtwistturn

2. bend a joint

    e.g. flex your wrists
           bend your knees

    Synonym: bend

3. form a curve

    e.g. The stick does not bend

    Synonym: bend

4. contract

    e.g. flex a muscle

5. exhibit the strength of

    e.g. The victorious army flexes its invincibility