This circuit may make a tri-state logic pen or is installed in the multimeter and the digital logical experiment box.

该电路可做成三态逻辑笔或装置在万用表、数字逻辑实验箱中使用。

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It's not a matter of logic that the pen must fall; it's a matter of fact.

笔必须要下落，那并不是物质的逻辑而是物质事实。

youdao

It's not a matter of logic that the pen must fall; it's a matter of fact.

笔必须要下落，那并不是物质的逻辑而是物质事实。

youdao