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。
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.
当他们了解他们的身体语言所不自觉地发出的信号有多强烈时，他们已经有所收获了。
The learning moment arrives when they learn just how powerful a signal these "body language" cues send.
在这个问题上，一份气候改变的双边协议将会发出强烈的信号。
A bilateral deal on climate change would have sent a powerful signal on this subject.
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