1. 随...变动：大数定律 law of larger numbers | 随...变动 vary with | 在相反的情形下 in the opposite situation
2. 变化：vary from 不同 | vary with 变化 | vary 改变
3. 随...而变化：vary from 与...不同 | vary with 随...而变化 | wait on 伺候,招待
4. 随着...改变：start with 着手... | vary with 随着...改变 | acquaint ...with 使...与...认识