the difference between derivation and inflection

derivation: [ deri'veiʃən ]
n. 引出,诱导,来历

Examples:
1. A line of descent; derivation.
血缘鉴定血统的联系；来历
2. Place of origin; derivation.
起源起源的地方；出处
3. Taxpayer: what do you mean by the method of derivation?
纳税人：什么是以支出换算收入？

inflection: [ in'flekʃən ]
n. 屈曲,变调,音调变化

Examples:
1. The violin has a poor inflection.
这把小提琴的音调不准。
2. In English, some questions have a rising inflection.
在英语中有些疑问句需要用升调。
3. A falling inflection of the voice, as at the end of a sentence.
声音降落，降句调发音时下降的音调
4. In certain languages, the inflection of nouns, pronouns, and adjectives in categories such as case, number, and gender.
词形变化某些语言中，名词，代词和形容词在格，数和性等方面的词形变化