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(astronomy) the Solar System
The Solar System is composed of eight planets, including Earth.
a system of measurement
In this experiment, we will use the International System of Units.
coordinate system
We use this coordinate system to locate the position of an object.
(astronomy) the Milky Way
We are a part of the Milky Way.
dating website
He found her on a dating website.
an ecosystem (system of an ecological community and its environment)
The ecosystem of this lake is very fragile.
inertial frame of reference
In physics, the inertial frame of reference is a very important concept.
Kyūjitai form of 体系: system; organization
This system is very complex.
the meridian system
He is deeply involved in the study of the meridian system.
an immune system
Because her immune system is weak, she catches a cold easily.
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