They have a very close friendship.
The trees are tall like her childern
Answer:
I think it means calculations involved in determining how much fuel the EDS needs to safely make it down to the planet with its cargo.
:
Salarino and Solanio, two Venetian merchants, notice their friend Antonio has been out of sorts lately. Antonio has sent several ships abroad to trade goods in many ports, so his friends speculate that he has overextended his fortunes in shaky investments.
I hope it will help