It is implausible, but not impossible, that any soldier smuggled a leather ball-or even the inflatable pig's bladder inside the casing-to the trenches.

At the start of the game, a small white leather ball, called a'jack', is thrown onto the playing field.

比赛开始的时候，先把一个皮革制的球扔到场地中央。

Customers are welcome to elect By Ballot for Best and worst shop assistants. The good will Be rewarded and the Bad will Be punished as to improve the service continuously.

欢迎顾客无记名投票评选最佳售货员与最劣售货员，我们将奖优罚劣，不断提高服务质量。

Ballot for [ against] the bill

投票赞成[反对]该法案

We were worried that the result of the ballot might go against us.

我们正担心投票的结果会对我们不利。

At one point, he said, that if Jesus could vote in Illinois, he would cast a ballot against Obama.

他说，有一点，如果哟上帝在伊利诺伊州投票，他将投奥巴马的反对票。

The Gun Interior Ballistics Design Method Based on Two-phase Flow and Application in New Charge

基于两相流理论的火炮内弹道设计方法及其在新型装药设计中的应用

The Interior Ballistics Study of the Different Quality for the Balanced Gun

质量平衡炮不等质量的内弹道研究

Applications of blind hole temperature measuring technology in interior ballistics tests

膛壁盲孔测温技术在内弹道测试中的应用

Average Field Conservation Equations for Two& fluid Model in Interior Ballistics

膛内双流体模型的平均场守恒方程

A Simple Analysis on the Study of Basic Theories of Interior Ballistics

当前火炮内弹道基本理论研究浅析

The general solution of the Lagrangian problem in interior ballistics

内弹道学拉格朗日问题普遍解

Gas Dynamic Derivation of the Basic Equation in Classical Interior Ballistics

经典内弹道学基本方程的气体动力学推导

Based on the study in this paper, Experiment on stability of external ballistics for hollow projectile, the static pressure of Jet flow field, emission theories of the pre-nozzle low recoil weapon are carried out.

根据本文所研究内容，分别对环形空心弹丸外弹道稳定性、喷口外流场静压力、喷管前置式低后坐武器发射性能进行了实验研究。

Characteristic curves for the external ballistics of small caliber A/ A guns or of ganged rockets when shooting continuously are of much significance regarding their accuracy, density of fire, etc.

小口径高炮或多管火箭连续发射时弹的外弹道特性曲线的测试，对于研究和制定连射武器的精度、密集度等至关重要的效力指标有着极为重要的意义。

The critical breakthroughs have been taking place in the structural designs, internal and external ballistics, and mathematical models, and it is now in dynamic firing test phase.

结构设计、内外弹道、数学模拟都取得了重大突破，已达动态发射试验阶段。

To satisfy the requirements of developing ground-to-air trajectory correction, based on external ballistics and the characteristic of impulse engines, found one corrected model.

根据开发低成本脉冲控制的空射型弹道修正弹的实际需要，本文基于外弹道理论。

The particular parameter of the parachute was obtained via calculating the external ballistics parameters.

利用外弹道参数，进行降落伞的具体参数计算，求得降落伞的具体参数。

Parameters and curve of external ballistics was obtained via simulation with software MATLAB.

并通过MATLAB软件进行数值仿真，获得子弹外弹道曲线和弹道参数。

The method is concise and convenient for program, simulation and computation. It can be applied in many study fields, such as rocket launch dynamics, external ballistics, firing table.

该方法简洁方便，易于编制程序及模拟仿真，便于工程人员掌握，可用于火箭发射动力学、外弹道学及射表编制等方面研究，具有一定应用价值。

The problems for this idea have stress intensity in firing, extended methods and motion of extended structures, exterior ballistics, terminal ballistics and etc for the telescopic projectile.

这一新概念研究涉及到发射、伸出方法及伸出机构的运动与强度、飞行稳定性和终点效应等问题。