The improvement of tandem device performance is attributed to the efficient electron and hole injection from charge generation layer to two adjacent emission units.

叠层发光器件性能的提高与中间电荷产生层向上下两个发光单元有效的电子、空穴注入有关。

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Likewise, the CO2 emission results generated by AMEE have default units of kg/year.

同样，AMEE 生成的 CO2 排放结果的默认单位是 kg/year。

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North American heavy duty truck sales peaked in 2006 with 360, 000 units, just ahead of tighter emission standards, and plunged to 110, 000 units in 2009.

WSJ: Will Truckers Ditch Diesel for Natural Gas?