zài / jiě / sān / jiǎo / xíng / wèn / tí / shí / wǒ / men / kě / yǐ / yòng / zhèng / xián / dìng / lǐ / qiú / chū / wèi / zhī / biān / de / cháng / dù

在解三角形问题时，我们可以用正弦定理求出未知边的长度。

When solving a triangle problem, we can use the law of sines to find the length of an unknown side.