1. No surplus of accumulated purchasing power stands between him and the tyrannies of unfriendly nature .
    在个人与不友善的自然的残暴之间不存在聚集的购买力过剩.

2. I find her very aloof and unfriendly.
    我觉得她非常冷淡, 不好相处.

3. I've helped them make persuasive presentations, answer unfriendly questions, communicate more effectively.
    我帮助他们，使他们所作的演讲有说服力，教他们如何回答不友好的提问，以及如何与人更有效地沟通。