失眠 insomnia n.
繁荣 prosperity n.
激起 引发 trigger v.
净化空气 purify the air
振奋精神 cheer up/ uplift
香味--fragrance n./ scent n.
促进睡眠 induce/ promote sleep
牡丹：peony --It stands for prosperity and wealth in traditional Chinese culture.
菊花：chrysanthemum --in memory of those who passed away.
紫荆花：Chinese redbud-- It’s the symbol of Hong Kong.
针对好处来展开The benefits of flowers，let's brainstorm！
Firstly, uplift mood.
“well， I'd like to buy flowers and display them in a common area like living room or kitchen as the fragrance（香味） and liveliness of the flowers can trigger （触发）happy mood or spark happiness in people around. I always feel delighted when seeing them. In addition, displaying flowers at home also helps to make guests feel welcome and help them elevate （振奋）their mood.”
表示“此外”： in addition， additionally， besides， what's more， apart from that ...
表示因为的词和短语：owing to; due to ; because of ; as; since; the main reason is that...
Secondly, help sleep.
Flowers like lavender can release a nice scent (香味)that can help us to relax and induce sleep（促进睡眠）. smelling the scent of lavender can help me to feel more peaceful and serene(平静的). It can lower the stress that causes insomnia among people.
Thirdly, beneficial to health.
Flowers can purity the air by releasing oxygen and absorbing carbon dioxide, and increase the level of moisture in the air, which plays an important role in dry places. Thus, it reduces the chances of getting health problems such as a common cold, dry skin and dry cough.
Last, boost creativity.
Employers who work in offices without plants often lack visual stimulation(视觉刺激) and putting some flowers and green plants in the office can boost brain activity. People can think more creatively and openly. A more productive(丰富多产的) mind will then lead to more success at work.
以上整理仅供参考，小考鸭们平时多去积累话题词喔。更重要的是，学以致用，不断演练。Practice makes perfect, 当然啦，找一个水平更高的口语伙伴演练模拟。