Reducer related questions?

Why is the speed ratio of some reducer on the sample book large, but the torque smaller?

The ratio of 3 to 10 is that the sun wheel keeps getting smaller and the planet wheel keeps getting bigger. That's why the torque ratio of 3 and 10 is lower, especially 10, because the sun wheel is too thin. Once the sun wheel breaks, the whole reducer will break.
So when choosing the type, try to avoid 3 and 10, choose 4, 5 and 7 ratio.
What speed ratios are not recommended?

Previously, we talked about the selection:try to avoid 3 and 10, choose 4, 5 and 7 ratio.

From this:
Not recommended: 12/15, 30, 70, double stage 100
Recommended optional speed ratio: 16, 28/35, 64/80, grade three 100