. Navigation的动词形式是navigate，表示“导航，指引方向”，比如navigate by stars (靠星辰确定方向)。Worldbulletproof backpacks防弹书包Many parents in the United States bought bulletproof backpacks for their kids as the new school year started ……

, The New York Times reported.That’s why sales of bulletproof (防弹的) backpacks in the US have risen 200 to 300 percent recently, CNN reported. Parents have bought these backpacks for their children ……

Special glass stops bullets防弹玻璃如何防弹？Q: How is bulletproof glass made bulletproof?A:The secret to bulletproof glass is plastic! It's calledlaminate(层板). This is a piece of plastic sandwiched between ……

and a blue bulletproof vest with “UN” printed on it in white. The red armband with golden stars shows he... dominate the marketplace ― from plugs and electric shavers to backpacks, sneakers and mobile phones ……

to stand out among them? A beautiful and useful backpack can be a great idea!Backpacks are easy... hiker (登山家) Dick Kelty made the first modern backpack in 1951. He made backpacks with nylon (尼龙 ……

to stand out among them? A fashionable and useful backpack can be a great idea!Backpacks...地). With a unique backpack, you can also stand out among your classmates.Tourists also love backpacks ……

WE have all been bothered (惹恼) by big backpacks on crowded subways, and now New York City... will launch a new campaign making people take off their backpacks on the subway, US news website buzzfeed ……

纽约地铁拟在车厢里禁止背双肩包。WE have all been bothered by big backpacks on crowded subways, and now New York... Transportation Authority will launch a new campaign making people take off their backpacks on the subway, US ……

time. The name of the band stands for “Bangtan Sonyeondan”, or “Bulletproof Boy Scouts”. They will go ……

  可回收的背包可回收的背包Backpacks are usually made of five to 10 materials (材料). It is hard....Backpacks are usually made of five to 10 materials (材料). It is hard to recycle them. A German ……

of carrying too much in their backpacks."It hurts my back when I run," said Ebelin Reyes, a student... students whose backpacks were weighed for a week in a recent study.They had regular backpacks with two ……

BACKPACKS (双肩背包) are convenient (方便). They can hold your books, your lunch, and clothes. They leave..., the researchers found that wearers use less energy than when putting on common backpacks. Also, the new packs ……

BACKPACKS (双肩背包) are convenient (方便). They can hold your books, your lunch, and clothes. They leave..., the researchers found that wearers use less energy than when putting on common backpacks. Also, the new packs ……

was killed by three gunshots. While mourning, his son Jerry dreamed of a bulletproof man ……

). It could give soldiers “superhuman” abilities. The bulletproof (防弹的) suit has 360-degree cameras ……