Sapwood contains xylem vessels, but not as strong as heartwood.边材含有木质导管, 但不如中心木质那样坚硬.Heavy wood with dark colored heartwood used for ornaments.重硬且心材呈浓色者可供作木艺品制造用.Heartwood from dark brown to purple brown, alternating str...
电子照相得到的星象看起来模糊,似乎是离焦的像.Electronographic star images appear soft and out of focus.离焦是造成图像模糊的最常见原因之一.Defocus is one of the most familiar reason inducing image degradation.它使用的形状与离焦技术的扩散.It used shape from defocus technique...
They are still having to live on very low incomes.他们现在还得靠微薄的收入过日子。The family was forced to live on credit from local merchants.这家人不得不靠向当地商人赊账生活。The fish live on the plankton.这种鱼靠吃浮游生物为生。...