这些琴粗糙、简单又廉价，琴弦的数量从两根到六根不等。
They were rough, simple and cheap with different numbers of strings, from two to even six.
您可以定义一个带有相等和不等测试的自定义类，来包含带有根元素
You may define a custom class with equality and inequality tests to hold all XML documents with the root element
用一根长10cm~20cm不等的金属或橡胶质地导管穿过腹壁直插胆囊。
Workers use a 10cm to 20 cm catheter made of metal or rubber to pierce through abdominal wall into the gallbladder, making the bile streaming through the catheter into the container.
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