《剑桥高阶英汉双解词典》angle条的一个例句：
The boat settled into the mud at a 35 degree / an angle of 35 degrees. 船身呈35度角倾斜陷入烂泥中。
我不知道35是大于1的数。a 35 degree中degree为什么不需要复数，而an angle of 35 degrees中用复数。 请专家指教，谢谢！
1. 你的句子：The boat settled into the mud at a 35 degree/ an angle of 35 degrees. 船身呈35度角倾斜陷入烂泥中。
2.请核对原文，应该是：
The boat settled into the mud at a 35 degree angle / an angle of 35 degrees. 船身呈35度角倾斜陷入烂泥中。
3.a 35 degree angle 中的 35 degree 是定语，所以 degree 不需要复数。类似的例子如：
The boat is now leaning at a 30 degree angle. 船正以30度角倾斜。
Place the shelf at a 90 degree angle to the wall. 把这个架子与墙成90 度角放置。
He took up a 10 year lease on the house at Rossie Priory. 他签了一份10年租约，租下了罗茜大宅的房屋。
They made a 3,000 mile detour simply to prove a point. 他们绕行3,000英里只不过为了证明自己可以做到。
The new head of state should be chosen by an 87 member representative council. 新的国家元首应该由包含87名成员的代表委员会选出。
