external dose的用法和样例：
例句
- The total radiation dose should be administered within a predetermined time span.
要在预先规定的时间范围内完成总的照射剂量。 - The combination of external beam irradiation with brachytherapy may decrease the dose of external irradiation, so the late radiation complication may be reduced.
采用外照射与腔内近距离放射治疗可以降低外照射剂量，减轻部分放射并发症。
