单词：line integral
line integral的用法和样例：
例句
- Numerical integration of ordinary integrals and line integrals.一般的积分以及线积分的数值积分。
- If the field changes slowly, we can replace the time integral by a line integral over the unperturbed orbit.如果场缓慢改变，我们能够用未扰动轨道的线积分来代替时间积分。
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