The terms of the contract were drafted in accordance with international standards.

in 是介词，表示"在...之内"或"按照..."。 accordance 是名词，来自动词 accord（一致、符合），意思是"一致、符合"。 with 是介词，表示"与...一起"或"伴随"。 in accordance with 是一个固定短语，意思是"依据、按照"，表示遵循某个标准或规定。