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。
Hogwash fat containing large quantity of animal and vegetable oil adds difficulty to be treated with, hogwash fat also causes serious environmental pollution and resource waste by sluiced directly.
餐饮泔水油中含大量的动植物油脂增加了污水处理的难度，泔水油的直接排放也造成了严重的环境污染及资源浪费。
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