• occur
• Spontaneous non-sexual erections frequently occur during adolescence and during sleep. (wikipedia.org)
• Because this syndrome can be acquired or occur at random and has spontaneous resolution, Brown hypothesized one major truth for this disorder - that the short tendon sheath was due to a complete separation, congenital paresis, of the ipsilateral (on the same side) inferior oblique muscle and secondary to a permanent shortening. (wikipedia.org)
• material
• Usually a stress called static fatigue limit is present, representing the boundary below which the material does not fracture, no matter how long the test duration is. (wikipedia.org)
• A related concept is the work of fracture ( γ w o f {\displaystyle \gamma _{wof}} ) which is directly proportional to K I c 2 / E {\displaystyle K_{Ic}^{2}/E} , where E {\displaystyle E} is the Young's modulus of the material. (wikipedia.org)
• test
• features the return of original improv stars Ryan Stiles, Wayne Brady and Colin Mochrie, who along with a special guest each episode, must put their comedic skills to the test through a series of spontaneous improv games. (sitcomsonline.com)