The ground is a box that is static, which Box2D knows, because the box has zero mass (by default) and therefore doesn't collide with other objects.
地面是一个静止的立方体，这是Box2D已知的，因为这个立方体的质量为零(默认)，因此不会与其他物体相撞。
For an object to be in static equilibrium, it is not enough that the sum of all forces is zero.
处于静力平衡的物体，仅仅所有作用力之和，为0是不够的。
They too tend to hold a static zero-sum version of the issue.
他们在这个问题上也倾向于静态零和游戏的观点。
Calculations of static properties are dealt with transfer functions at zero frequency.
静态特性计算运用零频率的传递函数。
Especially, the process that the static instability mode transforms into the dynamic instability mode is simulated as the dynamic characteristic parameter increases to a certain value from zero.
特别分析了随着动力特征参数由零增加到一定值后，由静力失稳模态过渡到动力失稳模态的过程。
External and static variables are initialized to zero by default. Automatic variables for which is no explicit initializer have undefined (i. e., garbage) values.
外部变量和静态变量初始的时候默认值为零，自动变量在初始的时候是没有默认值的。
When the velocity of the rigid wall is zero, these formulas degenerate to that for the interaction of air shock wave with static rigid wall.
当刚壁速度为零时，这些公式退化成空气冲击波遇固壁相互作用的计算公式。
High-power static bypass switch, overload automatically switch to bypass when the power supply, zero switching time;
大功率静态旁路开关，过载时可自动转旁路供电，零切换时间；
The object particle means to the microcosmic particle that its static mass is not zero, for example, electron atom molecule and so on.
实物粒子是指静止质量不为零的微观粒子，如电子、原子和分子等。
From the wave-particle properties of photon, the author presents a method with which the static mass of photon can be deduced to zero.
给出了由光子的波粒二象性推导光子静止质量为零的一种方法。
External and static variables are initialized to zero by default.
外部变量和静态变量的缺省值为0。
External and static variables are initialized to zero by default.
外部变量和静态变量的缺省值为0。
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