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重点讲解：
1. day by day 每天；天天；逐日；
例句：Day by day I am getting better and better.
我在一天天地好转。
2. tuck away 妥善收藏；安全保管；
例句：I tucked the box away in the linen drawer.
我把盒子藏在放棉织品的抽屉里。
3. take up 占用，花费(时间、空间或精力)；
例句：All those rodents are easy to care for and take up very little space.
所有这些啮齿目动物都容易照看，而且只占很小的空间。
4. throw away 扔掉，丢掉；
例句：I've got boxes of old clothes in the attic, which I really should throw away.
我在阁楼上有好几箱旧衣服，真该都扔了。
adj. 不毛的；不生产的；徒劳的；非生产性的
