適當(dāng)?shù)馁|(zhì)量，適當(dāng)?shù)臄?shù)量，適當(dāng)?shù)臅r間，適當(dāng)?shù)牡攸c(diǎn)，好的印象，適當(dāng)?shù)膬r格，適當(dāng)?shù)纳唐?/p>
