外架的英文：
outer tower

bearing outer race
轴承外座圈

He disclosed the outer covering on the bike.
他揭去自行车上的覆盖物。

He heard a voice in the outer room.
他听到外屋有人说话。

Emotion is our response to the outer stimuli.
情绪是我们对外界刺激的回应。

The outer skin of the orange is called the 'zest'.
橙子皮称为zest。

sketch of the tower
对那座塔作素描

A small tower or tower-shaped projection on a building.
塔楼,角塔建筑物上伸出的小型塔或塔状建筑

The towers are surfaced with steel plates.
在塔面上加了一层钢板。

There is a small tower of luggage there.
那儿有一小堆叠得高高的行李。

The tower leaned a little to the right.
塔有些向右倾斜。