Emission permit system — a type of transferable permit system in which the permits are defined in terms of the right to emit a stipulated amount of emissions.

排放许可系统——转让许可系统的一种类型，这个许可确定了在权限方面可排放物总额排放的约定。

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A new type of field emission cathode was devised.

设计了一种新的金刚石场发射阴极工艺。

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Field emission display is a new type of flat-panel display and field emission cathode is an important component part of field emission display.

场致发射显示器是一种新型的具有竞争力的平板显示器，场致发射阴极是场致发射显示器的重要组成部分。

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Finally, Declan looked at the BMW Hydrogen 7 - its only emission is water vapour but the technology for this type of green car is still being developed and currently, there are no models on sale.

BBC: NEWS | Programmes | Breakfast | Low carbon family: "Green" cars