两个/t/ 连在一起时，读一个，稍微加重就好了。

“twinning of /t t/  /t/” : the two /t/ sounds join together to create one slightly stronger /t/. So ‘it takes two’ becomes 'it takes two'. This is an example of twinning or gemination. Here are some more examples.

这种情况很常见哦，见下面的例子。

1. It takes two to tango. （一个巴掌拍不响）

2. It took him twenty years to get to the top.

3. You don’t have to cheat to pass the test.

4. You were right to be upset.

5. We took the overnight train to Venice.

6. You are great too Tom!

详见 https://www.bbc.co.uk/learningenglish/english/features/pronunciation/tims-pronunciation-workshop-ep-23

同样的道理，两个/s/连在一起时，也连起来, 读成一个稍长的/s//哦～

1. She's silly.

2. He's sitting over there.

3. Can you come this Saturday?

4. That's so unfair!

5. He looks sad.

6. He really is stupid.

详见 https://www.bbc.co.uk/learningenglish/english/features/pronunciation/tims-pronunciation-workshop-ep-3