external reference method的用法和樣例：
例句
- A quantitative analytical method was established for fomesafen by using reversed phase HPLC.
采用高效液相色譜外標法對氟磺胺醚進(jìn)行定量。 - When, however, there is a strong interaction between them, the ISTD method gives better results than the ESTD method.
當物質(zhì)之間有強的相互作用時(shí)，外標法比內標法準確。
