常有的英文怎么说

常有的英文：
there used to be

• A rainbow is usually seen after a heavy rain.
  大雨之后常有彩虹。
• A patient with advanced neoplastic disease often presents with anemia
  晚期肿瘤病人常有贫血。
• Diarrhea may occur around the impaction and often with fecal incontinence
  在粪块嵌塞期间可发生腹泻，并常有大便失禁。
• There are many persons, however, who have frequent bouts of epigastric pain and heartburn for years
  然而有很多病人常有多年阵发上腹痛和烧心。
• The knives and forks set up their regular jingle.
  刀叉发出常有的叮当声。
• The knives and forks set up their regular jingle.
  刀叉发出常有的叮当声。
• A hearty slating always does me good.
  由衷的批评对我常有好处。
• Arbitrary arrests and detention without trial were common.
  不经审讯随意扣押是常有的。
• Heartburn and sour "acid" eructations are frequent
  常有烧心感和嗳酸。
• The upside of a coin usually has a head on it.
  硬币正面常有个头像。

• It is used as a reflexive.
  它被作为反身代词使用。
• That was a balk to us.
  那对我们是个挫折。
• They help us to be maximal encouraging to us.
  他们来帮助我们对我们是个极大的鼓舞。
• Already used and therefore unavailable for further use.Used of taxonomic names.
  已占用的已经使用因而不能再作他用的。用于分类学名称
• Why use wood when you can use plastic?
  既然能用塑料，何必非用木料？