mathematically

It is possible to model such a system mathematically.

做出这种统数学模型是可能。

In order to define this irrotationality condition mathematically, let us consider the equation of motion in terms of velocities.

为了从数学上确定此无旋性条件，我们考虑以速度为未知函数运动方程。

CONCLUSIONS: When all other identified risk factors were controlled for mathematically, metastasectomy maintained a significant surial adantage for patients with pulmonary metastatic melanoma.

当其他风险因子算术控制后，转移瘤切除术对有肺转移性黑色素瘤患者仍有显著生存优势。