Population fluctuations of both species were erratic in respect to annual occurrence, the time of the peak density of fluctuations within years, and the hight of peak the density a given year.
根据两种田鼠种群波动周期性、波动峰值出现的时间以及特定年份峰值的高度等特征，证明两物种波动均具有不稳定性。
Great interest is focused on femtosecond laser micro-nano fabrication due to the ultra-short time scale and ultra-high peak power density characteristics of the femtosecond lasers.
飞秒激光由于其超快时间特性和超高峰值功率特性在精密微纳加工领域引起了人们广泛的重视。
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