Suddenly quint spied the triangular fin of a shark coming towards them.

昆特突然发现一条鲨鱼正竖着三角形鳍朝他们游来。

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After an hour or two, a triangular fin sliced the surface of the water and circled the group.

约莫一两小时后，一尾三角鱼鳍划过水面，围着一群人转起了圈。

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Another detail considers the addition of horizontal reinforcing plates (cover plates) to the beam flanges; a third adds vertical triangular (fin) plates to both beam flanges.

另外两个节点分别考虑了连接在梁翼缘的水平加劲板的作用和连接上下两个翼缘的垂直三角板的作用。

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