sinking

• The frog ducked his head and sank .
  青蛙低下脑袋，沉入水中。
• His eyes [cheeks] have sunk in .
  他的眼睛面颊凹下去了。
• Her voice had sunk almost to a whisper .
  她的声音低如耳语。
• He is sinking fast .
  他迅速地一天比一天更衰弱（快要去世）。
• His cheeks were sunken and his cheek-bones prominent .
  他脸颊凹陷，颧骨突出。
• The ship struck against the rocks and sank .
  轮船触礁沉没。
• We must sink our differences and save the firm .
  我们必须消除分歧以挽救公司。
• This time he'll sink or swim .
  这回对他将是成败在此一举了。
• Sink one 's voice to a whisper .
  把自己的声音减小变成耳语。
• The little flame of life sinks lower and lower .
  生命的细小的火焰越来越微弱。