“单一的”用英语怎么说

许多理论都标榜以单一的原因解释生长.Many theories purport to explain growth in terms of a single cause.所有喇叭都接在单一的扩音器上.All the speakers hook up to a single amplifier.单一的 、 孤立的磁极从来未找到.A single, isolated magnetic pole has never been found....