to not do what one said one would do
не сделать того, что человек сказал, что сделает (ne sdelat' togo, chto chelovek skazal, chto sdelayet)
"He went back on his word about helping me."
"Он не сдержал своего слова о помощи мне." (On ne sderzhal svoego slova o pomoshchi mne.)
to be so surprised that you doubt what you see
to make others happy by being kind or cheerful
to treat someone fairly and with respect
Extremely large data sets that may be analyzed computational...
to work very hard without rest
unfortunate or unlucky situation
