垂向上生物降解程度是上轻下重，平面上为北轻南重、东轻西重。

Biodegradation levels of heavy oils become slight gradually from bottom to top in the oil column and from south to north, west to east in the research area.

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原田桜怜是模特中“上重下轻”的极端例子，在她出演的12部DVD中也形成了自己的特色，在日本她继续保持着众多追随者。

Ourei Harada is the extremely top-heavy model who has been featured in dozens of DVDs and continues to enjoy a huge following in Japan.

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