Such measures, on the other hand, send strong signals that there are serious problems requiring attention.

另一方面，这些措施传递出一个醒目的信号：有一些严重的问题需要我们留意。

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Once the gas-filled microbubbles seek out the cancers and attach to their vessel walls, they send out strong signals that are picked up by standard clinical ultrasound scanners.

一旦充满气体的微气泡发现癌细胞并粘附到他们的血管壁上，他们就会发出强烈信号，该信号可通过标准的临床超声扫描仪捕获到。

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