[机] modulus of direct elasticity, modulus of longitudinal elasticity
zòng xiàng tán xìng mó shù ㄗㄨㄥˋ ㄒㄧㄤˋ ㄊㄢˊ ㄒㄧㄥˋ ㄇㄛˊ ㄕㄨˋ