The natural method lays stress on comprehensible input, setting up a goal at different stage and paying attention to the learners' interest and feelings.

自然法强调可理解性的输入，分阶段确立教学目标，在课堂上关注学习者的主观情感因素。

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It follows four years of research and development aimed at finding a natural method of tackling the problem of sea lice.

BBC: Western Isles salmon farm in wrasse 'first'

In the study released Wednesday, researchers suggest extracting the natural gas hydrates with "depressurization" -- a method that involves changing the ice into gas and water at the surface.

CNN: Study: Tap natural gas from Alaska's frozen areas

The other method of genetically modifying a natural seed is to insert into it a gene that makes the crop tolerant to a specific herbicide, usually one the company makes itself.

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