Current spot prices are hovering around $50 a metric ton, up from the low of $36 late last year but still off their highs of $120.
铁矿石的现货价格目前在每吨50美元左右波动，虽然高于去年底时每吨36美元的低点，却仍低于每吨120美元的历史高点。
That change persists even after the current is switched off, making it possible to build an extremely low-power device.
即使是切断电源，改变仍再在继续，这使得建立极低功率设备成为可能。
Additional features include: programmable transition delay, low quiescent current, higher efficiency at light loads, and high speed control to quickly turn off both gate drivers.
其它附加功能包括：可编程跳变延时、低静态电流、在轻载时提供更高的效率，以及快速关断两个驱动器的高速控制。
The critical current density of pure MgB2 is comparable to that of triniobium tin at low magnetic fields but falls off much more rapidly at higher fields.
在低磁场下，硼化镁的临界电流密度与三铌化锡相当，但是在较高的磁场下却下降得很快。
The critical current density of pure MgB2 is comparable to that of triniobium tin at low magnetic fields but falls off much more rapidly at higher fields.
在低磁场下，硼化镁的临界电流密度与三铌化锡相当，但是在较高的磁场下却下降得很快。
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