If we don't tighten the rules, the students will continue to take advantage of us.
Si no hacemos las reglas más severas, los alumnos seguirán aprovechándose de nosotros.
If you don't tighten the strings on your racket regularly, it will be very difficult to play well.
Si no aprietas las cuerdas de tu raqueta regularmente, será muy difícil jugar bien.
Don't tighten other muscles (stomach or legs, for example) at the same time.
No contraiga otros músculos (estómago o piernas, por ejemplo) al mismo tiempo.
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