股骨是人体中最长的骨头。

The femur is the longest bone in the human body.

缝匠肌是人体中最长的肌肉。

The sartorius is the longest muscle in the human body.

夏至标志着一年中最长的一天。

The summer solstice marks the longest day of the year.

医生解释说肱骨是手臂中最长的骨头。

The doctor explained that the humerus is the longest bone in the arm.

六月第二十一日是一年中最长的一天。

The 21st of June is the longest day of the year.

大象的怀孕期是所有动物中最长的之一。

Elephants have one of the longest gestation periods of any animal.

直角三角形的斜边是直角三角形中最长的边。

The hypotenuse is the longest side of a right triangle.

《古兰经》中最长的章节是Al-Baqara。

The longest sura in the Quran is Al-Baqara.

它们中最长的是什么？

What's the longest one of those?

公里是米制中最长的长度单位.

The kilometer is the biggest unit of length in the metric system.