Repeated skin contact may result in absorption of harmful amounts. Inhalation: Brief exposure (minutes) is not likely to cause adverse effects. at 100 ppm; higher levels produce eye, nose, and throat irritation and are intolerable at 1000 ppm. Anesthetic effects are seen at or above 1000 ppm.
There are three types of Chinese in general: 1. Mandarin, written using short-form (Simplified Chinese) characters-Mainland China and Singapore 2. Mandarin, written using long-form (Traditional Chinese) characters-Taiwan 3. Cantonese, written using long-form characters-Hong Kong and overseas Chinese.
As you can see, there are two Chinese characters for English (the language), which are ying1 yu3 in Pinyin. Pinyin is the international standard romanization scheme for Chinese characters, which is useful for learning the phonetics of Mandarin. There are four tones in Pinyin and we use the numbers here, i.e., 1, 2, 3, and 4, to depict the four tones. If you want to learn Mandarin (or Pu3 Tong1 Hua4), you have to master the four tones of the language. However, one pinyin usually represents many Chinese characters.