zh.wikipedia.org/wiki/%E7%B1%B3%E6%86%90

This wording is too broad and is historically incorrect.

• William Milne is described by the Biographical Dictionary of Chinese Christianity as the "Second Protestant missionary to China".
• The Council on Foreign Relations explains that early waves of Christianity in China began with Jesuit missionary Matteo Ricci in the late 16th and early 17th centuries, and separately notes that Robert Morrison was the first Protestant missionary to China in 1807.

So Milne was not the second Christian missionary to China overall. A historically accurate description would be that he was the second Protestant missionary to China (or the second missionary sent to China by the London Missionary Society after Robert Morrison).

This sentence gives the wrong place of death for William Milne's wife.

• The Biographical Dictionary of Chinese Christianity entry for Rachel Cowie Milne states that "Rachel Milne died in Klebang, Malacca in March of 1819 and was buried there".
• The BDCC entry for William Milne also says that Rachel became ill after childbirth in Malacca and "She died on March 20, 1819," after which William himself was later buried alongside her in the Dutch cemetery there.

So the place of death was Klebang, Malacca (in present-day Malaysia), not Macau.