Notice with this TR cluster, it's very common to hear that as a CHR. This is true of all words with the TR cluster. So rather than hearing tr, tr—transfer, you'll probably hear chr- chr- transfer, with a light CH sound.
请注意，对于这个 TR 组，发 CHR 的音是很常见的。所有带有 TR 群的单词都是如此。因此，你可能听到的不是 tr，tr-transfer，而是 chr- chr- transfer，有一个轻的 ch 音。