They tweaked the composition, shape and size of the antennae until they arrived at spiral structures a few nanometres (billionths of a metre) across.是什么意思_They tweaked the composition, shape and size of the antennae until they arrived at spiral structures a few nanometres (billionths of a metre) across.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句