只有在20世纪时，随着儿科学和心理学的发展，这些研究才能在一个更客观的基础上进行，即使这一基础仍然不一定很科学。

It was only with the growth of paediatrics and psychology in the twentieth century that studies could be carried out on a more objective, if still not always very scientific, basis.

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然而，虽然自由派为这个结果欢呼并以此作为社会进步的标志，但是它不一定预示萨巴赫家族18世纪以来对科威特统治就这么简单。

Yet while liberals have cheered the result as a mark of social progress, it does not necessarily augur plain sailing for the al-Sabah family that has ruled Kuwait since the 18th century.

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有批评人士指出，在20世纪，全球地表温度的记录在一定程度上可能被城镇带来的热量以及其他因素侵蚀过。

Some critics argue that the global record of land surface temperature over the 20th century could be to some extent corrupted by heat from towns and other factors.

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