The intention was to get close , fire a projectile into the surface and grab some of the ensuing dust .
它原定目标是接近这颗小行星,发射一抛射物(探测器)进入小行星表面,从而捕获扬起的尘埃。
In shrapnel 's shells this fuse was made of gunpowder . In the xm25 it is a small computer inside the bullet that monitors details of the projectile 's flight .
Wind and other environmental factors can push a bullet off course by 30 feet . According to our simulations , in the same circumstances our projectile gets within inches , which could require fewer rounds and minimize collateral damage .
Last year 's class built a 37-pound , 8.5-foot-long carbon-fiber projectile with advanced data-collection systems onboard .
去年的班级建造了一个37磅、8.5英尺长的碳纤维弹,上面有先进的数据收集系统。
But it 's less clear whether the weapon that caused the blow was a thrown projectile , churchill said .
churchill说,更难推定这个伤痕是否是由投掷武器留下的。
Avoid projectile toys , such as darts , bows and arrows , and missile-firing toys .
避免投射类的玩具,例如飞镖,弓和箭以及点燃弹射类的玩具。
Experts have suggested that the neanderthal may have fallen on his own spear , been fatally poked by a fellow hunter-or been killed by a projectile weapon , which only modern humans were known to use .
Washington - the us navy announced a successful test on friday of an electromagnetic cannon capable of firing a projectile 110 nautical miles ( 200km ) at five times the speed of sound .
Instead of mowing people down , it can stick to the fine print of the first law of robotics and fire tear gas canisters , smoke grenades , smoke bombs and perhaps even taser 's upcoming 40mm people-zapper projectile .
Imagine that some huge rocky projectile , big enough to destroy most forms of life , was hurtling towards the earth , and it seemed that deep international co-operation offered the only hope of deflecting the lethal object .