And this dub is called the second heart sound, or S2.

这个“dub”声被称为第二心音，或S2。

Try to pronounce the second sound immediately after you release the first sound.

试着在发出第一个声音后 立即发出第二个声音。

This is the only way you'll actually get to the second sound if you visualize a W sound.

如果你想象 W 音，这是得到第二个音的唯一方法。

The most noticeable difference is the second sound is a long vowel and I smile a little bit more.

最明显的区别是第二个音，这是一个长元音，我的嘴巴咧得更开。

Then we quickly go through the second sound, the Y glide, and the schwa on the way to the P sound. Yuh. I-yuh.

然后我们快速通过第二个声音，Y 滑音，以及通往 P 声音的 schwa。 嗯。 我-嗯。