He often works by rule of thumb.他通常凭经验办事.As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.凭经验估计，一杯过滤咖啡约含80毫克咖啡因。A good rule of thumb is that a broker must generate sales of ten times his salary ...
这种作法有时会使复杂的波形畸变, 模糊了同相轴的识辨标志.Such manipulation can sometimes distort complex waveforms, obscuring identification of events.偶极子在它的轴的方向上不发射能量.The dipole does not radiate energy in the direction of its axis.这种绕方位轴的运动称为冲击偏差....