The Ruby version doesn't use an extra facility such as ExpandoMeta Class.

Ruby版本并未使用额外的工具，比如说ExpandoMeta Class。

youdao

Well it's not the main prop, it's an extra facility, it's all part of our graduated response, we had them last year, we deployed them on the ground but didn't actually use them.

BBC: News Online

There was no need to expand the facility or hire extra staff.

FORBES: It's Not The Doctors: It's The System!

Tsarnaev is in an area of the facility where there's extra security, he said.

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