changeless

remaining the same for indefinitely long times

长期保持不变

unalterable

not subject or susceptible to change or variation in form or quality or nature

不受或不易受形式、质量或性质的变化或变化的影响

the view of that time was that all species were immutable, created by God

当时的观点是所有的物种都是不可改变的，都是上帝创造的

immutable

unvarying in nature

不变的

maintained a constant temperature

保持恒温

principles of unvarying validity

不变效力原则

constant

invariant

unvarying