perennial是什么意思

双语用例

• The plants are tough perennials, less than a metre high.

• While it may be conducive to bean growth, deep hoeing may be detrimental to bananas or other perennials associated with the trees.

• Herbaceous perennials with type 1 seed banks should be reintroduced by sowing.

• In other words, the pressure of disease has not led to the downfall of perennials.

• If perennials can fix an adequate amount of carbon to make them viable crops, the question becomes one of harvest index rather than trade-off.

• However, there is a difference in the response for annuals and perennials crops.

• The project also entails helping local people near the camps to plant perennials such as coffee trees and oil palms.

• In the dry season the green perennials were tested.