2 sentences

1. 这辆公交车只在这个区间内运行。

   zhè liàng gōng​jiāo​chē zhǐ zài zhè gè qū​jiān nèi yùn​xíng.

   This bus only runs within this section.

   Source: Dong Chinese Dictionary

2. 我们需要计算这个样本的置信区间。

   wǒ​men xū​yào jì​suàn zhè gè yàng​běn de zhì​xìn qū​jiān.

   We need to calculate the confidence interval for this sample.

   Source: Dong Chinese Dictionary