Unlike widebodies, narrowbodies usually only have two main wheels for each landing gear.

与宽体机不同，窄体机的每个起落架通常只有两个主轮。

This is because widebodies are far heavier than narrowbodies and thus need to distribute their weight across a greater area.

这是因为宽体机比窄体机重得多，因此需要将重量分布在更大的区域。

This is common in smaller aircraft but not on standard commercial  narrowbodies.

这在小型飞机上很常见，但在标准商用窄体飞机上并不常见。