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. As they grow old, people also accumulate belongings for two other reasons,
    相信总有一天需要的正好是那些东西。人们年老之后也喜欢收藏东西，不过是出于两个不同的原因：

5. Slowly other experiences began to accumulate, reminding me of a real change in my life status.
    渐渐地愈来愈多的其他经历都在提示我：我的生命状态已真的出现变化了。