obstructer
n. 障碍物；妨碍者
同义词
参考例子
1.However, we find that the principle often plays as an obstructer during the reform of curriculum implementation and even feels confused from the research and practice at home and abroad.
然而在国外的研究中，发现校长常常是“改革的一种阻力，而不是推动力。”
英文解释
n.
1.someone who systematically obstructs some action that others want to take
2.any structure that makes progress difficult