major constituent

例句：

1. 1.The new device has a major constituent of plastic and metal.
   新设备主要由塑料和金属构成。
2. 2. The study found thatthe major constituent of the diseasewas a lack of vitamin D.
   研究发现，这种疾病的主要组成成分是缺乏维生素D。
3. 3.The company's success is largely dueto its major constituent, theskilled workforce.
   公司的成功在很大程度上归功于其熟练的劳动力。