一定频谱范围内的无线电波只能搭载有限的广播频道；同轴电缆只能传 输有限的电视频道。
The radio spectrum can carry only so many stations, and a coaxial cable so many TV channels.
传语VEGF-D在乳腺癌中具有一定的诱导淋巴管生成的作用，并与肿瘤的淋巴侵袭转移及预后相关。
VEGF-D may induce lymphangiogenesis, and may be associated with lymph node invasion and prognosis in breast cancer.
手传振动对人体健康有一定的危害，如何对其评价是工程中急需解决的问题。
It is a problem how to evaluate the in fluence of hand-transmitted vibration to human health.
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