Reindeer can allocate less energy to heating their extremities and more energy to maintaining stable temperature in their body core. And even different parts of a reindeer leg are adapted for optimal cold temperature performance.
重点词汇及拓展：
1. reindeer[ˈreɪndɪr]：n.驯鹿
2. allocate[ˈæləˌket]：v.分配，拨... allocate sth to sb/sth
3. extremity[ɪkˈstrɛmɪti]：n.四肢limbs；极端the extremity of pain极度疼痛；末端，尽头 eastern extremity of the mountain range山脉最东端
4. core[kɔ:(r)]：n.中心部分 the earth's core地核 ；核心 sth is at the core of sth
5. optimal[ˈɑ:ptɪməl]：adj.最佳的 optimal use of resources 对资源的充分利用
重点词汇及拓展：
1. reindeer[ˈreɪndɪr]：n.驯鹿
2. allocate[ˈæləˌket]：v.分配，拨... allocate sth to sb/sth
3. extremity[ɪkˈstrɛmɪti]：n.四肢limbs；极端the extremity of pain极度疼痛；末端，尽头 eastern extremity of the mountain range山脉最东端
4. core[kɔ:(r)]：n.中心部分 the earth's core地核 ；核心 sth is at the core of sth
5. optimal[ˈɑ:ptɪməl]：adj.最佳的 optimal use of resources 对资源的充分利用
