玛丽把头向后仰，以便能看到他。Mari tilted her head back so that she could look at him.她保留了许多副本以便作进一步的注解。She retained a number of copies for further annotation.手边放一本便笺簿，以便有问题时随时记下。Keep a pad handy to jot down queries as they occur....
It's a constant struggle to try to keep them up to par.要让他们达标，需要不断努力。All the doors have been bricked up to deter vandals.所有的门都用砖堵了起来，防止破坏分子闯入。Across the river the railway track ran up to the pithead.铁轨跨过这条河直达矿井口。...