1. However, as the evidence began to accumulate, experts from the zoo felt obliged to investigate.
    然而, 当证据日趋增多时,该动物园的专家们感到有必要进行调查.

2. However, as the evidence began to accumulate, experts from the zoo felt obliged to investigate.
    然而, 当证据日趋增多时,该动物园的专家们感到有必要进行调查.

3. However, as the evidence began to accumulate, experts from the Zoo felt obliged to investigate,
    可是，随着证据越来越多，动物园的专家们感到有必要进行一番调查，

4. A parliamentary committee representing all political parties appoints a person who is suitably qualified to investigate private grievances against the State.
    议会内有一个代表各政党利益的委员会，由它委派一位称职的人选专门调查个人对国家的意见。

5. He immediately sent one of his lawyers to investigate the matter.
    他立即派出一位律师前去调查。