```perl
$hash{"chr01"}{"NAT"}=300;
$hash{"chr02"}{"lincRNA"}=278;
$hash{"chr03"}{"intronic"}=12;
$hash{"chr01"}{"NAT"}=13;
$hash{"chr02"}{"NAT"}=14;
foreach my $key1 (keys %hash)
{
# 按染色体进行打印
my $hash2 = $hash{$key1}; #
foreach my $key2 ( keys %$hash2)
{
print $key1."\t".$key2."\t".$hash2->{$key2}."\n";
}
# 按染色体进行打印
}
```
