free carrier

基本解释

Under the new rules, the state forbade production of ultra-thin bags under 0.025mm thick and ordered supermarkets to stop giving away free carriers.
根据新规则，政府禁止厂家生产厚度在0.025毫米以下的超薄塑料袋，并严令超市不得再提供免费塑料袋。
The results show that the magnetic field can effectively change the relative ratio between the singlet and the triplet polaron pairs, resulting in an increase in the density of the free carriers.
从聚合物光电池中光电流和暗电流的产生机制出发，对该现象进行了解释，认为外加磁场可以有效改变单重态极化子对和三重态极化子对之间的相对比例，进而使自由载流子浓度增加。
The lifetime of free carriers in a silicon-on-insulator(SOI) rib waveguide, which is used for Raman amplification, is studied in connection with the nonlinear optical loss.
研究了用于喇曼放大的绝缘硅（SOI）脊形波导中自由载流子寿命与非线性光学损耗的关系。

More importantly, sponsors and television carriers are free to take their business elsewhere as well.
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Without those subsidies, the feature-packed phones carriers hand out for free would cost several hundred dollars.
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