to keep; to maintain; to hold; to preserve[cedict]
航向
háng xiàngㄏㄤˊ ㄒㄧㄤˋ
course; direction (a ship or plane is heading in)[cedict]
幺
yāoㄧㄠ
youngest; most junior; tiny; one (unambiguous spoken form when spelling out numbers, esp. on telephone or in military); one or ace on dice or dominoes; variant of 吆, to shout[cedict]
三
sānㄙㄢ
three; 3[cedict]
洞
dòngㄉㄨㄥˋ
cave; hole; zero (unambiguous spoken form when spelling out numbers)[cedict]