这些青年科学家通过现场观察，获得了研究工作所需的第一手资料。
By making on-the-spot observation, the young scientist obtained first-hand information they needed in their research work.
这些青年科学家通过现场观察，获得了研究工作所需的第一手资料。
By making on-the-spot observations, the young scientists obtained first-hand information they needed in their research work.
这些青年科学家通过现场观察，获得了研究工作所需的第一手资料。
By making on-the-spot observations, the young scientists obtained first-hand information they needed in their research work.
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