/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: db02donna https://cdn.slidesharecdn.com/profile-photo-db02donna-48x48.jpg?cb=1523402227 The great thing is to know when to speak and when to keep quiet. Seneca the Younger Silence is often advantageous. Menander