The S is actually pronounced as a Z, 'tainz', so it's not 'tains' - 'tainz'.

实际上，“S”发音为“Z”，“tainz”，所“tain”，而“tainz”。

And again, captain, tain, tain, captain. Don't try to make a vowel there. Schwa N. Captain.

再一次，船长，坦，坦，船长。要试图在那里做一个元音。 Schwa N. 船长。