Undershield
下部保护物, 下部挡板, 挡泥板
🗣️ 情景例句
I know. I do.
我知道。我会的。
The world is a ladder for some to go up and others to go down.
世界好似一把梯，有人上去有人下。
Our knowledge of the oceans a hundred years ago was confined to the two-dimensional shape of the sea surface and the hazards of navigation presented by the irregularities in depth of the shallow water close to the land.
100年前，我们只知道海洋是二维平面形的，以及靠近陆地浅水区的深浅不一能给航行带来危险。