firstbornn.长子(或长女)adj.最先出生的firstadj.第一的；最初的adv.首先；第一n.最初；(序数词)第一first-grade discipline一级学科first-order expression一阶表达式first class misdemeanant一级轻刑罪犯first mobile workstation第一款移动工作站first level of packaging一级组装first-order absorption一级吸收first hypeaolarisability一阶超极化率First-Grade Instructor一级实习指导教师First Battle of Damascus第一次大马士革之战(公元605)first-speed gear shaft头档齿轮轴

1. The on-chip filtering reduces the external antialias requirements to first order, in most cases.
   在大多数情况下，通过片内滤波可将外部抗混叠要求降至一阶。
2. Also the low frequency glint is regarded as the white noise having passed through a first order filter.
   认为低频目标闪烁近似于白噪声通过一阶惯性环节所得到的有色噪声。