[掌握, zhǎng wòㄓㄤˇ ㄨㄛˋ] to grasp (often fig.); to master; to know well; to understand sth well and know how to use it; fluency; to control; to seize (initiative, opportunity, destiny)#1674
[既来之,则安之 / 既來之,則安之, jì lái zhī, zé ān zhīㄐㄧˋ ㄌㄞˊ ㄓ, ㄗㄜˊ ㄢ ㄓ] Since they have come, we should make them comfortable (成语 saw). Since we're here, take it easy.; Since this is so, we should accept it.; Now we have come, let's stay and take the rough with the smooth.; If you can't do anything to prevent it, you might as