請問一下，如何能將分別下載下來的中文字幕與英文字幕合併成一個檔案？
如下:
eng.srt6
00:03:40,516 --> 00:03:42,483
Good morning, Tower One.

7
00:03:42,552 --> 00:03:46,146
Exterior contamination index is 85 percent.

8
00:03:46,222 --> 00:03:47,711
Sunny and mild.

9
00:03:58,835 --> 00:04:00,825
Hey, I'm missing a left shoe.

cht.srt
7
00:03:40,516 --> 00:03:42,483
早上好，坦爾一號。

8
00:03:42,552 --> 00:03:46,146
外界污染指數是85%，

9
00:03:46,222 --> 00:03:47,711
晴天，溫和。

10
00:03:58,835 --> 00:04:00,825
嗨，我左腳的鞋少了一只，

eng+cht.srt

14
00:03:40,516 --> 00:03:42,483
Good morning, Tower One.
早上好，坦爾一號。

15
00:03:42,552 --> 00:03:46,146
Exterior contamination index is 85 percent.
外界污染指數是85%，

16
00:03:46,222 --> 00:03:47,711
Sunny and mild.
晴天，溫和。

17
00:03:58,835 --> 00:04:00,825
Hey, I'm missing a left shoe.
嗨，我左腳的鞋少了一隻，