然而，在上世纪末对与原始人类化石有关的动植物化石群进行进一步研究后，大草原理论遭到质疑。
Towards the end of the century, however, doubts were raised about the savannah theory, after closer examination of the fossilised flora and fauna linked with early hominid fossils.
结果表明：二苯胺双席夫碱类化合物具有较大的非线性光学系数，从理论上为进一步探索优质非线性光学材料提供依据。
The result showed that two - aniline - two schiffs bases has bigger nonlinear optical coefficient. It provides the theory foundation for go further research on good nonlinear optical materials.
本文阐述了软弱地基的土质特征，并从水文工程地质理论观点出发，对软弱地基中水泥类化学灌浆固结机理进行探讨。
Properties of the soil of soft foundation is expressed. According to the theory of hydrological geology, consolidation mechanism of chemical cement grouting in soft foundation is probed.
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