укрепиться во мнении(Teaching this student strengthened my conviction that the best way to learn a language is through conversation – Работая с этим студентом, я укрепился во мнении, что разговорная практика – это наилучший способ изучения иностранного языка. VLZ_58)
усиливать гарантии(The Act of Settlement of 1701 was designed to secure the Protestant succession to the throne, and to strengthen the guarantees for ensuring parliamentary ... Alexander Demidov)
укреплять иммунитет(a new quantum field technology called PureWave, which helps bee colonies thrive and grow by strengthening their immune systems with specifically tuned frequencies (coasttocoastam.com)ART Vancouver)
