通常在

• Abrasion tests are universally carried out under atmospheric conditions .
  耐磨试验通常在常压条件下进行。
• The diagnosis is usually not made until the end of the catarrhal stage .
  诊断通常在卡他期终了前尚不能作出。
• The nucellus is usually degraded and absorbed as the endosperm develops .
  珠心通常在胚乳发育时被分解和吸收。
• Usually there is lively chatter before the evening's diversion .
  通常在晚上娱乐之前，总有一阵很活跃的叽叽喳喳的谈话。
• Usually a gas cooler is used between the combustion chamber and hydrator .
  通常在燃烧室和水合器之间设置一个气体冷却器。
• Frequently they are used as the sensitive elements in more complex instruments .
  通常在较复杂的仪器中用它们作为灵敏的元件。
• It is usually good practice to cull the poorest prior to field planting .
  通常在实践上的好方法是在出圃栽植前挑出最弱的苗木。
• Disease-producing bacteria develop normally within the tissues of an infected host .
  致病的细菌通常在罹病的寄主的组织里发展。
• Dermal hypersensitivity usually does not develop until three to four weeks after onset .
  皮肤过敏通常在起病后三、四周内不会出现。
• Goods are usually delivered by the seller to a carrier before shipment on board takes place .
  卖方通常在装船之前将货物交给承运人。