Some seismometers are capable of detecting ground motion as small as 1 billionth of a meter, or about 40 billionth of an inch.是什么意思_Some seismometers are capable of detecting ground motion as small as 1 billionth of a meter, or about 40 billionth of an inch.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句