mainly black based
主要以黑色为主
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The third, the Real-Time Memory Database based on the red-black tree and the querying optimization program are mainly researched.
第三，着重研究了基于红黑树的实时内存数据库数据组织结构及其查询优化方案。
youdao
Obviously, there's the Congressional Black Caucus, it's mainly based in the House.
NPR: Reid Prepares for Role as Majority Leader
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