about替换词有approximately、approaching、close to
basic替换词有essential、indispensable、elementary、rudimentary
begin替换词有commence、initiate
big替换词有massive、extensive、immense
get替换词有obtain、acquire
hard替换词有arduous、rigorous
job替换词有undertaking、occupation、vocation
know替换词有comprehend、perceive
try替换词有attempt、endeavor、venture
think替换词有conceive、ponder、contemplate