刻舟求剑的英文：
[Literal Meaning]
mark/boat/find/sword
to mark the boat in order to find the lost sword

[解释]
不懂事物已发展变化而仍然静止地看问题。

[Explanation]
to take foolish actions without consider the changing environment

[例子]
这样做等于是刻舟求剑，你难道没有看到情况已经发生了很大的变化吗？

[Example]
What you did was to mark the boat in order to find the lost sword. Haven't you seen that the situation had changed a lot?

Be stubbornly stupid
刻舟求剑

A very stupid way of doing things
刻舟求剑