滑滑板时带护肘和护膝是必要的.Elbow pads and knee pads are essential on a skateboard.所有参赛者比赛时都必须佩带安全头盔及护膝、肘等可能必要的安全护具.It is mandatory that riders wear and approved safety helmet during racing.我要一副护腕和两副护膝.I want a pair of wrist protecto...
I don't want to have your tucker.我不想吃你的食物....Sophie Tucker's revealing autobiography.索菲·塔克揭露往事的自传She presented a bravery award to schoolgirl Caroline Tucker.她向女学生卡罗琳·塔克颁发了英勇奖状。...aquatic consultant Ben Tucker.水...
She wore a checkered jumper and had ribbons in her hair.她穿着格子连衣裙，头上系着丝带。Her hair was interlaced with ribbons and flowers.她的头发上编扎着缎带和花。Typewriter ribbons may be all black or black and red.打字机的色带可以是全黑的或黑红色的....
Effects of surfactant on viscosity of cetyl hydroxyethylcellulose ( CHEC ) solution were investigated by rheometer.通过流变仪研究了几种表面活性剂对十六烷基羟乙基纤维素 ( CHEC ) 溶液黏度的影响....