For the meaning of Eminent - expansion. Harvest - determination click HERE
Line 2: "Embrace crop failure". The two characters together mean 'be generous': help in bad times.
Pínghé means swiftly crossing the river Hé. The ideogram is horse and ice. If the big river is suddenly dry or frozen, then take your chance, react immediately. 'Hé' is the yellow river. According to Hertzer, it is the horse of Xiang Yu, who gave it as a present to a ferryman.
'Move central: right conduct, or moving halfway: not too much, not too little.
Line 4: not on guard, or: no limits.