翻译成地道的英文表达：式中，k为波矢，w为角频率， i=√(-1)为虚数单位，调幅函数u_k (r)具有周期性，其平移矢量与正格子相同：

Translate to authentic English: In the equation, k represents wave vector, w represents angular frequency, i=√(-1) represents imaginary unit, modulation function u_k (r) has periodicity, and its translation vector is the same as the primitive lattice.

Answer: In the equation, k denotes wave vector, w denotes angular frequency, i=√(-1) denotes the imaginary unit, modulation function u_k (r) exhibits periodicity, and its translation vector is identical to the primitive lattice.

相关问题

翻译成地道的英文表达：式中，k为波矢，是指沿某一方向传播的波在2π长度内波动行进的波周数，w为角频率， i=√(-1)为虚数单位，调幅函数u_k (r)具有周期性，其平移矢量与正格子相同：

The equation states that k is the wave vector, which refers to the number of wave cycles that a wave traveling in a certain direction completes within a 2π length. w is the angular frequency, i=square root of -1 represents the imaginary unit, and the modulation function u_k(r) has periodicity, with its translation vector being the same as that of the lattice.