科学家们在一块六英里见方的试验田内进行了勘测，他们发现那些有机碳来自筑造防洪大堤取土用的浅塘，有机碳化合物沉淀至塘底并慢慢渗入地下。

Using a six-square-mile test plot, they found that the organic carbon comes from shallow ponds that were dug to provide soil for flood protection.

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随着测试技术的不断提高，环境试验参数复合测试技术正逐渐渗入到环境试验中来。

With the improving of test technique, the multiple environment experiment parameter test technique has permeated in environment experiment.

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用5%曙红染料作泄漏试验后，剖开牙齿，观察染料渗入情况。

After the experiment of micro leakage with 5% eosin dye, the teeth were cut open, the permeation of the dye were observed.

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