斯皮策的科学家们说，核状星云中较大颗粒的存在暗示，星云已有相当的年纪，而且它拥有很多快速形成的行星。
The presence of bigger grains in a core cloud, Spitzer scientists say, suggests the cloud is relatively old and that it hosts faster-forming planets.
9月24日发布的斯皮策空间望远镜短红外波图像里，星光在黑暗的核状云中(中间图片)闪耀开来，这片星云处在更巨大的星云里，该星云被称作L183。
Starlight bounces off a normally dark, interstellar core cloud (center) inside a larger cloud called L183 in a short-infrared-wavelength Spitzer Space Telescope image released on September 24.
研究了铝合金点焊过程中声音信号的时频域能量分布，并应用它来识别点焊的熔核状态。
This paper investigates energy distribution of air-borne acoustic signals in time-frequency domain during aluminum alloys spot welding in order to identify weld nugget states.
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