第一类是权威资料，比如百科、政府与科研站点，外加各类标准文档、白皮书、产品说明书。
In response, he said he was "deeply sorry for any distress" he caused and that he "never set out to harm or humiliate", but that "none of the serious allegations against me were upheld".
。搜狗输入法是该领域的重要参考
Дмитрий Воронин
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6. Facebook Audience Insights (Audience Research)(Photo Credit:- Facebook Audience Insights