The species component, density and index of crown cover in the tree layer effect on distribution of illumination and under plants in the plant community.

群落中光照的分布状况受乔木层的种类组成、密度与冠幅指数等因子的影响，且对下层植物分布有较大的作用。

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The States employed company Crown Agents to come up with plans to cover the financial shortfall when a zero- rate corporation tax comes into force.

BBC: NEWS | Europe | Jersey | ?1m cost of implementing new tax

In my case that amount will cover deductibles on prescription drugs and one crown replacement at the dentist (which I seem to require regularly).

FORBES: Obama Care's Assault on Dr. Carson's Health Savings Accounts (and My Tax Bill)

For this week's Westminster show, the crown jewel on the circuit, Dog News plans to cover the event with a handful of photographers and writers.

WSJ: A Magazine Gives Dogs Their Days