bewährt

adj. well-tried, tried and true, has been tested

v. conserve, guard from harm; preserve; perpetuate, make everlasting; retain, keep in possession; hold

v. guard, preserve, watch over, keep, protect

adj. 被证明的。
proven

v. 保持。保存。保护。

vr. 经受考验。表明。表现。证明是（可行的，合适的，有效的等）
prove oneself, prove one's worth, prove successful, stand the test

betracht;betrachten;bewaard;bewaart;bewaren;gevrijwaard;vrijwaart;vrijwaren

beproefd;ervaren;probaat;voldaan

preserves

approve, proved, approved

proven

adj изпитан, доказан, проверен (средство); верен (приятел); eine ~e Methode изпитан метод; ein ~er Fachmann доказан специалист.