Slips of bamboo and wood are the most commonly used material for writing.

竹、木简牍是纸发明前最主要的书写材料。

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The role, working principle, structure and commonly used material of steel aluminum composite conductor rail in the three-rail system are introduced.

介绍钢铝复合导电轨在三轨系统中的作用、工作原理、结构和常用材料。

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In short, study English material that you can trust, that is commonly used, and that is correct.

简而言之，学习你所能信赖的，常用的，同时也是正确的资料。

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The ceiling was constructed of asbestos insulation board (AIB), a material commonly used in many buildings before it was banned in 1999.

BBC: Belfast Health Trust fined over City hospital asbestos

Firstly, the tutor writes down commonly-used words and uses them as teaching material, thus ensuring that the material is both familiar and of interest to the student.

UNESCO: Adult Literacy Tutors Association (ALTA)