It's not firsthand information.
那不是第一手资料。
It's not firsthand information, so I don't believe it.
这不是第一手资料，所以我不会相信。
School trips give children firsthand experience not available in the classroom.
学校组织的旅行可以给孩子们提供教室里学不到的亲身体验。
He knew firsthand the number was not more than eight.
因为他完全知道这一数字不超过8个。
He knew firsthand the number was not more than eight.
因为他完全知道这一数字不超过8个。
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