задолго

Задолго до -- long before, well before, well in advance of

 This failure mode called skidding can be experienced long before classical fatigue spalling.

 Does this imply that striation begins well before the sudden jump shown in Fig.?

 Furthermore, response to a certain day length well in advance of winter gives the insect's metabolism time to make the necessary adjustments for entering diapause.

Задолго до того как

 These differences started essentially instantaneously after power was applied, significantly prior to the delay time.

 The transient Biot modulus drops below 0.1 very quickly, substantially before the Ra reaches 1100.

 Actually, a full hydrodynamic film is formed long before that speed is attained.