🧶 Preliminary = coming before a more important action or event
Rus: предварительный

collocations: preliminary result, preliminary agreement/approval/decision, preliminary estimate

Preliminary results show that the vaccine is effective, but this had to be confirmed by further medical trials

🧶 Painstaking = extremely careful (=thorough, meticulous)
Rus: кропотливый

It took months of painstaking research to write the book

He was described by his colleagues as a painstaking journalist

🧶 Saturate = to become completely soaked up/wet (SAT word📙)
Rus: насыщенный, пропитанный

The grass had been saturated by overnight

Butter and cream contain a lot of saturated fats