Terms for subject American

Russian	English
в лучшем случае посредственный	sketchy at best (His theory about murder was sketchy at best. Val_Ships)
в противном случае	conversely (When the press was biased towards the political right, television coverage tended to lean to the left. Conversely, if the press swung heavily to the left, television would have to redress the balance by leaning to the right. Val_Ships)
в противном случае	otherlike (otherwise Beforeyouaccuseme)
в редких случаях	in rare cases (Linch)
кроме как в случае	short of (Баян)
ни в коем случае	no way
ни в коем случае	in a pig's eye
порядок замещения поста президента в случае его смерти или недееспособности	presidential succession
программа помощи фермерам в случаях крайней необходимости	agricultural emergency relief program (напр., при стихийных бедствиях)