María habló con un hilo de voz porque acababa de salir de la operación y aún estaba débil.
Maria spoke in a very faint voice because she had just come out of surgery and was still weak.
Durante la reunión, él contestó con un hilo de voz, casi susurrando, por el cansancio que tenía.
During the meeting, he answered in a barely audible voice, almost whispering, due to how tired he was.
No pude entender lo que dijo porque contestó con un hilo de voz, como si tuviera miedo.
I couldn't understand what he said because he answered in a very weak voice, as if he were afraid.
Aunque estaba emocionada, habló con un hilo de voz para no despertar a los niños que dormían.
Although she was excited, she spoke in a very soft voice so as not to wake the sleeping children.
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