反物质云由于其自身发射的伽玛射线而显现出来，当单个的反物质粒子遇到它们正常物质的对应体（这里是正电子遇到电子）彼此互相消灭了对方。
The cloud shows up because of the gamma rays it emits when individual particles of antimatter, in this case positrons, encounter electrons, their normal matter counterpart, and annihilate one another.
本文用电感耦合等离子体原子发射光谱法、X荧光光谱法测定了中国红花岗石和芝麻白花岗石的成份、X射线衍射谱及红外光谱。
In this paper, the composition and spectra of Chinaese red granite and sesame white granite are studied by ICP aes, XRF, IR and X ray diffraction.
利用X射线衍射仪和场致发射扫描电子显微镜等手段对合成粉体的相组成、结构和形貌进行了研究。
The phase composition and microstructure of mullite powders were investigated by X-ray diffraction and field emission scanning election microscopy techniques.
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