Translation of Schwachstelle

We spoke on Friday noon, I got your details through Vocabulix friends. That is similar to what you're teacher is using. It would be best if we could meet or communicate through phone or email.
They wanted to know everything about relationships in Switzerland. One of the asked me of how guys propose friendships to girls. I did not know what she meant and explained that we were very informal.
On the way we visited many small hill tribe villages. The walk was through green, wet rice fields. We really enjoyed it. Our guide explained us about the region and taught us some Vietnamese.