Xuxi Zhang

I cannot forget to thank my dearest parents, my family members, and my dear friends in China, for all the unconditional love and support in my life. Even though we are thousands of miles apart, I can always feel your love and support surrounding me. Because of you, I’m brave enough to overcome challenges in my PhD journey as well as embrace the coming brand ‐ new journeys of life! I will try my best to spend my wonderful life in the way I love and make happiness for more people. I wish all my beloved you stay healthy and happy forever. Finally, during this special period, I would like to thank all people who have ever contributed to the fight against the COVID ‐ 19 pandemic. I wish the whole world could overcome this disaster as soon as possible. Xuxi 21 st May, 2020 Rotterdam, the Netherlands A 259 Words of gratitude