Anal sex: Usually this term specifically refers to a penis penetrating an anus in anal intercourse.
肛交：通常是专指在肛门性交过程中阴茎插入肛门。
someone who engages in anal copulation (especially a male who engages in anal copulation with another male).
进行肛门性交的人（特别是两个男同性恋者之间的肛交）。
The greatest risk is through genital intercourse, especially anal-receptive intercourse.
最危险的是生殖器性交，尤其是肛交的接受方。
Anal sex without a condom is an extremely high risk activity for HIV transmission.
不用安全套的肛交绝对是HIV感染的高危行为。
However,homosexual anal intercourse,being an unnatural act,creates a lot of blood.
同性恋的肛交是一种不正常的行为，通常会产生大量出血。
Small tears in the vagina during vaginal sex or in the rectum during anal sex allow STDs to get into your blood.
阴道性交或肛交中致使的即便是轻微的皮肤破损都可能导致性传播疾病病毒进入血液中去。
Not only is anal sex facilitate the transmission of STDs better than any other form of sex, it can also cause urinary tract infections and other bacterial diseases.
这一点要记住，因为肛交不仅容易感染性病，还有可能导致泌尿系统感染以及其他疾病。
Seen here is on colonoscopy are views of hemorrhoids at the anorectal junction.
肛门直肠交界处的痔疮的结肠镜检图。
Insertion of the penis into the vagina or anus.
（性交时）将阴茎插入阴道或肛门
Quantitative Analysis of Parasympathetic Neurons Innervating the Rectum in Rats with Anorectal Malformation;
先天性肛门直肠畸形胎鼠腰骶髓副交感神经元的定量研究
Study of Treating the Perineum Infection of HPV 6/11 by Traditional Chinese Medicine
原位杂交检测与中药治疗肛周外阴HPV6/11型感染的对比研究
"Though the two terms are often used interchangeably, the colon technically excludes the cecum (a pouch at the Beginning of the large intestine), rectum, and anal canal."
虽然结肠和大肠常交替使用,但一般结肠不包含盲肠、直肠和肛管等部分。
perianal abscess
脏毒;肠痔;肛门周围脓肿;肛旁脓肿;肛周脓肿
Of, relating to, or near the anus.
肛门属于、关于或接近肛门的
"anal: Of, relating to, or near the anus."
肛门: 属于、关于或接近肛门的
Clinical Application of Ultrasonic Diagnosis on Perianal Abscess and Anal Fistula
超声诊断在肛周脓肿、肛瘘的临床应用
Primary radical surgery procedure in the treatment of perianal abscess 34 cases with therapeutic instrument for proctological disease
肛肠治疗仪一次性根治肛周脓肿34例
Study of Anorectal Manometry Before and After Fistula Surgery
肛瘘手术前后肛管直肠压力测定研究