密接

closely connected; inseparably related / (epidemiology) close contact (abbr. for 密切接觸者|密切接触者[mi4 qie4 jie1 chu4 zhe3])

to receive / to answer (the phone) / to meet or welcome sb / to connect / to catch / to join / to extend / to take one's turn on duty / to take over for sb

secret / confidential / close / thick / dense