保持积极的心态 Stay positive ; maintain a positive mindset

保持积极乐观的态度 remain positive

自然保护区的面积 Area of Nature Reserve

保持乐观的/积极的 stay optimistic/positive

积极与保守的投资者 The Aggressive Conservative Investor

积极的保证 positive guarantee

按公司章程保留的公积 Reserve provided for by the articles of association

终保持积极乐观的心态 Optimistic Attitude