Dogs make great pets, but don't leave them alone with small children.
狗是最好的宠物,但不要让狗和小孩子单独在一起。
Those that make the best use of their time have none to spare.
能充分利用时间的人不会有时间多馀。
There are even stories of half-trained elephant calves who have refused to feed and pined to death when by some unavoidable circumstance they have been deprived of their own trainer.