He chewed over the problem for several days before making his decision.他对这个问题详细考虑了好多天才作出决定。We can ponder over the ways and means before the construction work starts.我们可以在建筑工程开工之前详细考虑各种筹款集资措施。The details of the contract have been carefully thought out.合同的细节已经详细考虑过了。