51.   High-tech genetic engineering, covered ponds and aeration systems help fish grow even at high densities.

52.   High-rise buildings inevitably create a situation of high density population and all the inconveniences which go with it.

53.   The contract includes increasing capacity in the holy cities of Mecca and Medina, pilgrim centers with high density traffic.

54.   The high density of uranium makes the bullets more effective for piercing armor.

55.   The high density of uranium makes the bullets more effective at piercing armor.

56.   World Wide Fund for Nature scientific officer Reza Azmi says there is a high density of orang utans in Kinabatangan because of the diversity of vegetation in the area.

57.   Japanese specialised audio equipment maker Pioneer Electronic Corp. announced Thursday it had developed a prototype high density optical disc system capable of recording and playback.