Measure word
- 个 gè (classifier used before a noun that has no specific classifier); (bound form) individual attested
Stroke order
Show the animation Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation 
Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
How it used to be written
系
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Oracle bone script 商 -
Clerical script 東漢 - See all 14 forms
统
These are the forms of 統, the traditional character: 统 is a twentieth-century simplification, found in no ancient corpus.
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Small seal script -
Clerical script 東漢 - See all 3 forms
Forms, sources and dates: the 字形演變 database of 小學堂, Academia Sinica, public domain (CC0).
Examples
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Linux是一个免费的操作系统。你应该去试用一下。
Linux is a free operating system; you should try it.
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Linux系统的高手都会用命令行。
Linux experts are able to use the command line.
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Windows是世界上使用得最多的操作系统。
Windows is the most used operating system in the world.
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如果有帐户，你就能通过一个系统发送和接收邮件了。
If there is already an account, there is a system by which you are able to send and receive email.
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我的朋友正在为新的操作系统设计一个用户界面。
My friend is designing a user interface for the new operating system.
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我的笔记本电脑是Linux系统。
My laptop is running Linux.
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润滑系统设计得不好。
The lubrication system was poorly designed.
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系统是线性的吗？
Is the system linear?