Even at the age of 80, the old man's heart is as sound as a bell.

尽管已是八十高龄，老人的心脏仍毫无问题。

Even at the age of 80, the old man's heart was as sound as a bell.

尽管已是八十高龄，老人的心脏仍毫无问题。

I think a charming girl should be as sound as a bell, as merry as a cricket and happy-go-lucky every day.

我认为魅力女生应该每天身体健康，开心快乐，无忧无虑。

I have a dream that all the children in the world can be as sound as a bell, as merry as a cricket and as happy-go-lucky every day.

我梦想世界上所有的孩子都能每天身体健康，开心快乐，无忧无虑。

By using the receptive relaxation reflex of the stomach as a basis, artificial conditioned reflex has been established with the sound of an electric bell or a metronome as indifferent stimulus.

用食道扩张刺激为基础，以电铃声或节拍器声作为条件刺激，可形成胃容受性舒张的条件反射。