It turns out at that time of the year, in the summer, that birch was sending more carbon to fir than fir was sending back to birch, especially when the fir was shaded.
结果还表明在每年的这个时间，在夏天的时候，纸皮桦给花旗松送的碳比花旗松反送给它的要多，特别是当花旗松见不到阳光的时候。
The most widely used is linear, time-invariant digital filters, and IIR and FIR filters.
应用最广的是线性、时不变数字滤波器，以及IIR和FIR滤波器。
The discrete ZAK transform and Raised cosine FIR filter are used to design time-frequency well-localized pulse shaping filters for OFDM/OQAM systems.
本文提出一种利用ZAK变换及优化的升余弦滚降滤波器设计的OFDM/OQAM系统时频局域优化脉冲成形滤波器。
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