It's good to use a reference for the shape, such as drawing an ellipse within which the fire will remain and you can send the flames up to any of the edges of this ellipse.

比较好的做法是用一个参照物，比如画一个椭圆形让火焰保持在这个范围之内，而且你可以让火苗窜到椭圆的边缘处。

youdao

Is the reference drawing mentioned and shown correctly?

参考图的表述是正确的吗？

youdao

The reason of defects and danger to producing and drawing of rod also were analyzed in order to provide reference for producing and analyzing quality of high carbon steel rod.

分析了这些组织缺陷产生的原因以及它们对盘条生产和后续拉拔的危害，为高碳钢盘条的生产及产品质量分析提供参考。

youdao

"He was young and I had a very good time drawing his picture because I used a lot of reference material that were paintings made of him at different times in his life.

VOA: special.2009.02.27

Google is certainly helping Boingo by providing a marquee customer reference and drawing media attention to the service.

FORBES: Google And Boingo Extend Agreement To Offer Sponsored WiFi