In audiovisual AIDS, a device that allows a student to respond to the teaching material, e. g. answer a multiple choice question.

在视听辅助教学中使用的一种允许学生答复教材问题(如回答几种选择性问题)的设备。

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For metal material, give the form of the material, e. g. steel coil, rod.

对于金属材料，请给出材料形态，比如金属板材，金属线材。

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Heaters in the G-Series and M-Series product lines use a high-temperature material for their surface face.

系列和M系列产品线中的加热器使用高温材料作为加热器表面。

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G We can take the derivative of G with respect to how much material there is.

我们可以取,对物质总量的偏导数。

麻省理工公开课 - 热力学与动力学课程节选

Recycling hazardous electronic equipment for material recovery (e.g. rare earth, and precious and other metals) in a manner which can substantially mitigate the hazards, entails significant costs.

FORBES: It's Easy Enough To Solve The Problem Of E-Waste