曲折

tortuous;circuitous;winding;up-and-down(relationship); zigzags; twists and turns;complications;intricacies
前途是光明的，道路是～的。The road is tortuous,but the prospects are bright./两国关系经历了一条～的道路。The relations between our two countries have traversed a tortuous course(or path)./过去10年中，我们的关系有高峰，也遇到过～，有时上坡，有时下坡，有时也是平路。In the past decade,our relations have experienced ups and downs,successes and setbacks,and at times they were just passable./尽管经历了许多～，我们仍维持了我们的友好关系。Despite all the twists and turns,we’ve maintained our friendly relations./～地发展tortuously move forward