/ˈdɒldrəmz ||; ˈdɑldrəmz/noun [pl] an area of the Atlantic Ocean near the line around the middle of the earth(
the equator)where the weather can be calm for long periods of time or there can be sudden storms 赤道无风带（指赤道附近的大西洋地）
in the doldrums 1 not active or busy 不活跃；不繁忙: Business has been in the doldrums recently. 近来生意一直很萧条。
2 sad or unhappy 悲伤；郁闷