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。
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.
超短脉冲激光光源因其在物理、化学以及生命科学研究中的重要作用，一直是一个前沿性的课题。
As an important tool in physics, chemistry and life science studies, the ultrashort pulsed laser sources are on the edging of optical technology.
土壤特性的空间尺度问题是当今土壤科学研究的前沿，在进行土壤空间变异研究中，大孔隙的合理取样尺度分析对大孔隙流研究具有十分重要意义。
Spatial scale is forefront in soil-scientific research, so the analysis of macropore reasonable sampling size becomes significant which is in case of taking account of spatial variability.
土壤特性的空间尺度问题是当今土壤科学研究的前沿，在进行土壤空间变异研究中，大孔隙的合理取样尺度分析对大孔隙流研究具有十分重要意义。
Spatial scale is forefront in soil-scientific research, so the analysis of macropore reasonable sampling size becomes significant which is in case of taking account of spatial variability.
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