We'll leave some evenings free,that is,if it is all right with you.
如果你们愿意的话,我们想留几个晚上供你们自由支配。
Poison to a snake is merely a luxury; it enables it to get its food with very little effort, no more effort than one bite.
毒液对毒蛇来说只不过是一种舒适生存的优越手段,它使蛇不用费多大力气就能捕获到食物,轻咬一口即可。