Many theories purport to explain growth in terms of a single cause. 许多理论都标榜以单一的原因解释生长。
Such a taxation system which featured colonialism led to the establishment of an abnormal single - structured economy in French Indochina. 这一具有浓厚殖民主义色彩的税收体制是法属印度支那畸形单一经济结构形成的主要原因之一。