1. Experimental data seem to indicate that the amount of radon (Rn) in the water under the surface of the Earth waxes before an earthquake.
    实验数据似乎表明，地震前地下水中氡的含量会增高。

2. He was watchful, but not experimental.
    他观察审慎, 但不善于亲自尝试。

3. He was watchful, but not experimental.
    他观察审慎, 但不善于亲自尝试。

4. However, King´s theory was thought unconvincing by many people as it was based upon reasoning, not experimental proof.
    然而，金的理论被很多人认为是不能令人信服的，因为它是根据推理得来的，而不是通过实验证明的。