Meanwhile, the environmental accountant studies the integration needing a lot of discipline knowledge again, relatively great to the difficulty that its further investigates at present.
与此同时，环境会计研究又需要多个学科知识的融合，当前对其深入研究的困难较大。
The extensive use of pesticides in environment and the difficulty of their residue detection make the analysis of pesticides residue the foreland and hotspot in environmental science.
农药在环境中的广泛应用以及农药残留分析的困难，使得环境中农药的残留分析成为国际上环境科学研究的前沿和热点。
This continuous rigid-frame bridge construction of complex structure, and environmental factors, increases the difficulty of construction.
该连续刚构桥构造复杂，且受施工环境因素制约，增加了该桥施工难度。
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