system tracts的用法和样例：
例句
- Therefore, hydrocarbon source rocks formed in the early highstand system tract have the best hydrocarbon potential.
因此早期高位体系域中的烃源岩有较好的生烃潜力。 - A model for the Lower Tertiary framework and sequence system tract of Jiyang subbasin was established with the high_resolution sequence stratigraphy.
建立了济阳坳陷下第三系高精度层序地层格架和层序体系域的构成模式。
