Word + 性 (-ness / -ity)

Name a property rather than describe a thing

• An evaluator compares how safe two products are.
• we / us我们wǒ mento need需要xū yàofairly / rather比较bǐ jiào两种liǎng zhǒnggoods产品chǎn pǐn(modifier / structural particle)的desecurity安全性ān quán xìng。 — security安全性ān quán xìng names the property being compared.

Locate the pattern in real examples

• Word + nature性xìng (-ness / -ity): this这个zhè gequestion问题wèn tívery很hěnto have / there is有yǒurepresentativeness代表性dài biǎo xìng。; security安全性ān quán xìngto be / is是shì第一位dì yī wèi(modifier / structural particle)的de。
• Read the whole clause before choosing a translation. The examples show the pattern in use; the context below determines what the speaker claims.

Follow the speaker

this这zhè(measure word)件jiànmatter事shì的deimportance重要性zhòng yào xìngvery很hěnhigh高gāo。

• In the opening situation: we / us我们wǒ mento need需要xū yàofairly / rather比较bǐ jiào两种liǎng zhǒnggoods产品chǎn pǐn(modifier / structural particle)的desecurity安全性ān quán xìng。
• security安全性ān quán xìng names the property being compared.

Check the limit of the explanation

• nature性xìng forms established words; do not attach it freely to every adjective.
• important重要zhòng yào describes importance directly in this这zhèvery很hěnimportant重要zhòng yào; importance重要性zhòng yào xìng names the concept in it它tā(modifier / structural particle)的deimportance重要性zhòng yào xìng.

Repair the form before interpreting it

• The form security安全性ān quán xìngnature性xìngvery很hěnhigh高gāo needs repair here. Write security安全性ān quán xìngvery很hěnhigh高gāo instead; keep the word or frame in its demonstrated order.
• Form and meaning are separate checks. After the repair, explain the sentence in its situation rather than treating a familiar translation as a universal rule.

Keep the distinction

Read the full reference: HSK 6 grammar — Nouns.