A study was made of the properties of NR and the effect that natural rubber latex was conserved with feeble-acid-ammonium salt.是什么意思_A study was made of the properties of NR and the effect that natural rubber latex was conserved with feeble-acid-ammonium salt.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句