Frege thought sentence has direct and indirect reference in complicated context, Substituteing salva veritate not losing its effects.

弗雷格认为在复杂语境中，句子具有通常意谓和间接意谓，“保值替换”并不失效。

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In Wasington, America's top diplomat for Africa, Johnnie Carson,has called for talks between Sudanese President Omar al-Bashir and southern leader Salva Kiir.

VOA: special.2011.06.04

Speaking alongside his southern counterpart, Salva Kiir, Mr Bashir also called for peace and normal relations.

BBC: President Bashir orders South Sudan border to be opened

On Monday, Mr Kiwete's spokesman Salva Rweyemamu dismissed the allegations in the cable as outrageous.

BBC: Dubai investor denies bribing Tanzania's Kikwete

President Salva Kiir accused the north of stoking war and infiltrating saboteurs into his country.

ECONOMIST: Sudan north and south