现在国会给外国工人以签证保护，这样刻板的系统并不能使得劳动力供给与需求相符。
Congress now caps visas for foreign workers, a clunky system that does not match supply too precisely with demand.
研究结果还表明，由于供给燃料发生变化而引起的燃气轮机转速的改变，有利于改善混合动力系统的变工况性能。
The results also show that the performance of variable working condition of hybrid system can be improved by changing the rotational speed of gas turbine.
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