21.Everything has its time and that time must be watched.
萬物皆有時，時來不可失。
22.Take time when time cometh,lest time steal away.
時來必須要趁時，不然時去無聲息。
23.When an opportunity is neglected,it never comes back to you.
機不可失，時不再來;機會一過，永不再來。
24.Make hay while the sun shines.
曬草要趁太陽好。
25.Strike while the iron is hot.
趁熱打鐵。
