см. тж. пусть
• ( Let us ) suppose ( for argument's sake ) that all these students had their picture taken for the yearbook, where ...
• Say an optical reader is mounted on the spindle.
• Let ( us assume that ) Z i Z l = ...
• Put P 1 P/P 2 P = r .
• ( Now ) suppose the initial design calls for ...
• T is taken to be 2 hr.