no se contraigan

El Botox relaja estos músculos para que no se contraigan.
Botox relaxes the muscles so they do not contract.
Puede detectar áreas del corazón que no se contraigan apropiadamente o que no reciban el flujo sanguíneo necesario.
It can detect areas of the heart that aren't contracting properly or receiving enough blood flow.
Un retardo mínimo de la transmisión de la excitación asegura que las cámaras principales no se contraigan junto con las cámaras anteriores y que la sangre tenga suficiente tiempo de fluir desde los atrios hacia los ventrículos.
A slight delay of the transmission of excitation ensures that the ventricles do not contract simultaneously with the atria so that the blood has enough time to flow from the atria into the ventricles.
El Estado parte debería tomar medidas urgentes para erradicar la práctica de los matrimonios no registrados mediante, entre otras cosas, campañas públicas de sensibilización, a fin de que no se contraigan matrimonios antes de la edad legal.
The State party should take urgent measures to eradicate the practice of unregistered marriages and to take measures, including awareness-raising campaigns, to ensure that marriages do not take place before the legal age.
No se contraigan o se acobarden de ello sino que permitan que fluya a través de ustedes.
Do not shrink from it but allow it to flow through you.
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