求助两个文件匹配关键词并替换字段

[qingzijinyouwoxin]

cat aaa.txt
aa:11
bb:22
cc:33
dd:44

cat bbb.txt
99
88
77
66
55
44
33
22
11

想用bbb.txt行值为关键词匹配aaa.txt
输出结果为：

99
88
77
66
55
dd
cc
bb
aa

[乞丐的生鱼片]

就是有点儿麻烦，首先，拼接语句。再用tr拼接语句，去执行
cat /cygdrive/c/Users/dyuan/Desktop/aaa.txt | awk -F ':' '{printf("%s","tr \""$2"\" \""$1"\" | ")}'
cat /cygdrive/c/Users/dyuan/Desktop/bbb.txt | tr "11" "aa" | tr "22" "bb" | tr "33" "cc" | tr "44" "dd"