firsthand investigation的用法和樣例：
例句
- Use methods that permit direct investigation of the question.
使用直接調查研究問(wèn)題的研究方法。 - Apart from investigating complaints, The Ombudsman can initiate direct investigations of her own volition and may publish investigation reports of public interest.
除了調查投訴外，申訴專(zhuān)員還可以主動(dòng)展開(kāi)直接調查，并公布涉及公眾利益的調查報告。
