把金属线拉紧,然后把两头捻紧.Pull the wire tight and then twist the ends round.把这条金属线拉得很细才行.Draw out the wire until it is very thin.这种金属线便于卷绕.The wire rolled easily....
The resulting radiation is known as airglow.其发出的辐射称为气辉.The nighttime airglow, or nightglow, correspond to the intensity of a candle at 100 m distance.夜间辉光或夜辉相当于在100米距离的一支烛光的强度.These techniques include the ionospheric tom...