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.
There are over 100,000 Chinese characters recorded in the most advanced Mandarin Chinese dictionaries. New Chinese symbols are developed all the time, so the amount of Chinese characters never stops increasing. Pinyin is a way to write Mandarin Chinese with the Roman alphabet. In Chinese, pinyin literally means spelled sound. Pinyin is used in most Chinese language institutes to teach Mandarin as a second language. It's a way to read Chinese without having to know the characters.