A large metallic mesh ACTS as a net to catch these particles and have them push a spacecraft along.
一个巨大的金属网将用于捕获磁性离子，并用于推动飞船飞行。
Although we now know that current in metallic conductors is due to negatively charged electrons, we will follow the universally accepted convention that current is the net flow of positive charges.
虽然我们现在知道金属导体中的电流是由负电荷引起的，但我们将遵循通用的惯例，即把电流看作是正电荷的单纯的流动。
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