The short a in happy gives us a double p. The short o in opportunity gives us a double p, the short i in brilliant gives us double l.

短元音a使我们在 happy 中双拼p。短元音o使我们在 opportunity 中双拼p，短元音i使我们在 brilliant 中双拼l。

So we had getting with double t, brilliant with double l, opportunity with double p, will with double l, and also happy with double p and successful with double c and double s.

有双拼t的 getting，双拼l的 brilliant，双拼p的 opportunity，双拼l的 will，也有双拼p的 happy，双拼c和s的 success。