build sth in/on; build sth into/onto sth to make sth a part of sth else 使某物成为另一物的组成部份: They've made sure that a large number of checks are built into the system.他们已经确保这个制度内设有不少制衡机制。We're planning to build two more rooms onto the back of the house.我们打算在房子后面再盖两个房间。