单词：ultra-sound
ultra-sound的用法和样例：
例句
- The resulting ultrasonic sound wave can then be directed out in a tightly controlled beam.由此超声音波可以用严格控制声音的方向。
- Ultrasound of intra-osseous lesions in the mature skeleton would normally be precluded by almost complete reflection of sound from the cortical bone surface.由于骨皮质对超声声束的几乎完全的反射，超声显示成骨内病变较为困难。
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英文语法词汇