Systems
n. 体制, 体系；制度；系统（system的复数形式）
🗣️ 情景例句
I keep in touch with my family regularly.
我定期和家里保持联系。
Though malice may darken truth, it cannot put it out.
恶意可以遮暗真理，但不能抹杀真理。
So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.
从测定海深到测定鱼群，这一进展比较容易。