But a study in the journal Current Biology suggests that feeding birds in winter can influence their course of evolution.

不过《当代生物学》杂志上的一项研究却表明，在冬季向鸟类投食可能会影响到它们的进化进程。

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Longitudinal uniformity is decided to a great extent by weighting balance feeding fiber current and transverse uniformity is closely relating to air transverse distribution.

纵向均匀度在很大程度上取决于成网机定量喂给的纤维流，而横向均匀度还与气流横向分布密切相关。

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First we presume feeding rate, ascertaining the velocity of air current, ascertaining the feeding quantity by farm technical demand and ascertaining wind quantity, calculating the diameter of pipe.

首先假定输送比，初定气流速度，由农业技术要求确定排种量，从而确定风量，计算得到管道的直径。

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