Water is an obvious choice for the moderator of a thermal reactor and it can also serve as the coolant..水是热堆慢化剂很明显的选择,并且它也可以 用于作冷却剂。 It has excellent neutron slowing down properties which enable water moderated reactors to have much more compact cores than are possible in other types of thermal reactors.它具有优异的中子慢化性能,这使水慢化 的反应堆比其它类型的热堆堆芯更紧凑。 The capture cross-section of water is rather high(0.66 barns per molecule) so that water moderated and cooled reactors require enriched uranium for criticality.水的俘获截面比较高,所以水慢化冷却的反应堆需要浓编的铀以达到 临界。 It is, of cause, abundant, cheap and easily obtainable with high purity (please translate into Chinese) The main problem associated with the use of water as the moderator and coolant in a power reactor concerns its rather unfavorable thermodynamic characteristics.水作为动力堆慢化剂和冷却剂的主要问题是比较差的热力学性 质Water is an obvious choice for the moderator of a thermal reactor, and it can also serve as the coolant. 水是热堆慢化剂很明显的选择，并且它也可以 用于作冷却剂。 It has excellent neutron slowing down properties which enable water moderated reactors to have much more compact cores than are possible in other types of thermal reactors. 它具有优异的中子慢化性能，这使水慢化 的反应堆比其它类型的热堆堆芯更紧凑。 The capture cross-section of water is rather high (0.66 barns per molecule) so that water moderated and cooled reactors require enriched uranium for criticality. 水的俘获截面比较高，所以水慢化冷却的反应堆需要浓缩的铀以达到 临界。 It is, of cause, abundant, cheap and easily obtainable with high purity. (please translate into Chinese) The main problem associated with the use of water as the moderator and coolant in a power reactor concerns its rather unfavorable thermodynamic characteristics. 水作为动力堆慢化剂和冷却剂的主要问题是比较差的热力学性 质