如果许多可伸缩天线附着在微型无线电收音机上面，并且放置于大桥内部，它们就会随着桥相应地伸展或收缩，这样就会经常性的自我调谐。
If lots of flexible antennas attached to small radios were placed inside a bridge, they would expand or contract along with the bridge and so would constantly retune themselves.
近年来，内部天线几乎完全取代了传统的可伸缩及竹节天线。
In recent years, internal antennas have almost entirely replaced the traditional retractable and stubby antennas.
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