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ra    音标拼音: [r'ɑ]
n. [埃及神话] 太阳神

[埃及神话] 太阳神

Ra
n 1: an intensely radioactive metallic element that occurs in
minute amounts in uranium ores [synonym: {radium}, {Ra},
{atomic number 88}]
2: ancient Egyptian sun god with the head of a hawk; a universal
creator; he merged with the god Amen as Amen-Ra to become the
king of the gods [synonym: {Ra}, {Re}]
3: (astronomy) the equatorial coordinate specifying the angle,
measured eastward along the celestial equator, from the
vernal equinox to the intersection of the hour circle that
passes through an object in the sky; usually expressed in
hours and minutes and seconds; used with declination to
specify positions on the celestial sphere; "one hour of right
ascension equals fifteen degrees" [synonym: {right ascension},
{RA}, {celestial longitude}]

Ra \Ra\ (r[aum]), n.
A roe; a deer. [Obs.] --Chaucer.
[1913 Webster]


Ra- \Ra-\
A prefix, from the Latin re and ad combined, coming to us
through the French and Italian. See {Re-}, and {Ad-}.
[1913 Webster]

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  • Rheumatoid arthritis - Symptoms and causes - Mayo Clinic
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    Rheumatoid arthritis (RA) is a chronic (ongoing) autoimmune disease that causes pain, swelling and stiffness in the lining of your joints (synovium) It most commonly affects the joints in your fingers, hands, wrists, knees, ankles, feet and toes
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  • Rheumatoid arthritis - Wikipedia
    Rheumatoid arthritis (RA) is a long-term autoimmune disorder that primarily affects joints It typically results in warm, swollen, and painful joints Pain and stiffness often worsen following rest Most commonly, the wrist and hands are involved, with the same joints typically involved on both sides of the body
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    Learn more about RA and how to treat it Updated Oct, 15, 2021 Rheumatoid arthritis (RA) causes joint inflammation and pain It happens when the immune system doesn’t work properly and attacks the lining of the joints, called the synovium
  • Rheumatoid Arthritis - RA - Center: Symptoms, Pain Relief . . . - WebMD
    Rheumatoid arthritis (RA) is a type of arthritis that is considered an autoimmune disease An autoimmune disease is when your immune system starts attacking your body
  • Rheumatoid Arthritis | Arthritis | CDC
    Rheumatoid arthritis (RA) causes pain, swelling, and stiffness in the joints There’s no cure for RA, but you can manage and treat it with medicines and lifestyle changes It’s best to diagnose and treat RA early to avoid joint damage and worsening symptoms and complications
  • Rheumatoid Arthritis | CDC
    RA can also affect other parts of the body and cause problems in organs such as the lungs, heart, and eyes What causes RA? RA occurs when the body’s immune system attacks its own healthy cells The specific causes of RA are unknown, but some factors can increase the risk of developing the disease How is RA diagnosed?





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