Several hundred such drawings exist , scattered over many miles of desert : strange helmeted and antennaed figures , often floating in weightlessness as if the artist had been able to witness one of our modern space walks .
Biologists at northeastern university have peered directly at running muscles by measuring blood flow in the legs of the helmeted guinea fowl numida meleagris .
而美国东北大学的生物学家则是直接观察「盔珠鸡」的肌肉,测量跑步时血液在腿中流动的情形。
But you don 't see bars covering every single window or helmeted security guards swinging batons as you do in so many other big african cities .
在这里不像在其它的非洲城市那样,你看不到窗户上的防护栏,看不到带着头盔,手拿警棍的保安。
Some show the shadow of a helmeted soldier holding an assault rifle , inside a red circle with a line through it .
有些则显示一个红色圆圈杠上一条线,圈住一个头戴钢盔、手持突击步枪的士兵身影。
A column of about 100 helmeted riot police cut them off , and for the first time in memory , a group of at least 200 protesters rushed the barricade , shattering a glass advertisement and knocking at least one policeman to the ground .
The prize for the robot that looks most like a person , however , probably goes to robonaut 2 , a helmeted model that sports a torso , arms and humanoid hands that can manipulate tools made for people .