Your helmet is normally comprised of four elements: rigid outer shell, crushable liner, chin strap and fit or comfort padding.

您的頭盔日韩高清不卡福利片视频，通常包括四項內(nèi)容：剛性外殼欧美一级婬片A片免天堂，擠壓襯墊国产欧美日韩另类VA在线，下頦帶和適合或舒適襯墊成年妇女观看在线视频免费播放下载。

Its shell is divided into two parts. Its cranium is like a half helmet. There are things like the eyes in the front of its shell, 6 pairs of airholes and hard teeth of double layers in two sides of its back. There are the thin, sharp and hard thorns on its shell. Its tail is triangular, which can move about.

其殼分為兩部分亚洲tv精品一区二区三区，頭蓋形似半只鋼盔，殼背前端有眼狀物久久国产精品特及毛片，兩側對稱分布氣孔6對厕拍网站；背甲布細尖硬刺，邊有雙層細長硬齒在线看国产黄av；尾呈三棱形整體图片区偷拍区，根部可動。

Second , considering the texture of helmets , it is not good if the helmet shell is too brittle or too thin.

其次又色又爽又舒服的视频，考慮到頭盔的紋理国产人人操人人摸，這是不好的，如果頭盔殼太脆或太細欧美在线a免费观看。

The so-called good permeability is means the helmet shell with ventilation holes.

所謂良好的透氣性日日摸夜夜添高潮出水毛片，是指具有通風孔頭盔的外殼。

This fiber glass shell helmet comes in nine fresh and sharp color schemes.

這種玻璃纖維外殼頭盔有九個新的和尖銳的顏色方案大学生一级一片第一次一级莫。

In order to protect helmet cap shell, the helmet must have certain thickness, and cause the increase of the material cost and weight.

為保有頭盔帽殼具一定的強度黄色国产区视频，頭盔須具有一定的厚度，而造成材料成本與重量的增加国模高清。

Under the heavy white shell of my helmet , the flies were beginning to bite.

盡管我戴著沉重的白色頭盔久久久久精品免视频94久久精品视频，蚊子還是不停來叮咬。

At issue is the density of the Kevlar cloth — woven by SMC — that is attached to the shell of the helmet and provides ballistic protection.

引起爭議的是頭盔中提供子彈防護的凱夫拉爾面料的密度—由SMC編織而成黄色视频bb大。

The "look" is purpose-driven by Arai's belief that you can make changes to a helmet shell as long as you never forget its primary function of impact management, thereby "requiring" the use of smooth surfaces without exaggerated ridges or protrusions that may look impressive, but that in a crash possibly have an adverse effect on the helmets main job – manage impact energy.

在&看&為宗旨，由井的信念男人爽到高潮喊叫视频，你可以只要你永遠不會忘記它的影響管理的主要功能国产午夜三级片免费观看，從而&規(guī)定&的順利沒有夸大山脊或突起的表面，可能會使用更改為一個頭盔殼體驅動印象深刻黄色视频永久免费观看，而且在一場事故可能會對頭盔的主要工作產(chǎn)生不利影響-管理沖擊能量亚洲国产aⅴ精品一区不卡。