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1·Roughen the surface before applying the paint.

先把表面弄毛糙再涂颜料。

2·By sanding the split leather surface to roughen it up.

是通过打磨分割层皮革的表面，使它变粗糙而得到的。

3·You'd better roughen the surface before applying the paint.

你最好先把表面弄毛糙再涂颜料。

4·Before painting the wood, roughen the surface with sandpaper.

油漆木器前， 先用砂低把表面磨毛糙。

5·You will then need to roughen the surfaces to prepare them to hold the materials.

你便要他们准备表面粗糙的材料进行。

6·Then, it removes dead surface skin that can dry, roughen and dull your complexion.

去除皮肤表层导致皮肤干燥、粗糙和晦暗的死皮细胞。

7·If maximum recoat interval is exceeded, roughen the film surface to ensure the adhesion between layers.

如超过最大重涂间隔，须磨粗表面，以确保漆膜间的附着力。

8·These ingredients can cause bleeding under the nails, discolouration and can roughen the smooth texture of the nails.

这些成分可引起指甲下出血，变色，甚至使原本质地光滑的指甲变得粗糙。

9·A mini-sized sand-blasting gun of ejection-and absorption type, used to clean and roughen the metallic surfaces for thermal spraying.

一种小型的射吸式喷砂枪，可用作喷涂喷焊前的表面清洁毛化处理。

10·Its synchronous construction process includes milling and planing the concrete bridge surface to roughen, cleaning and blasting with special apparatus;

施工方法，采用专用设备对混 凝土桥面板表面浮浆进行铣刨、拉毛或凿毛、清扫、吹净处理；