1. as time went on

随着时间的推移

eg. As time went on, David became very ill. There was nothing that I could do but watch him die.

随着时间的推移，大卫病得越来越严重，而我，除了看着他死，竟然什么都做不了。

eg. As time went on, many of these first settlers settled down and began to farm and domesticate animals.

随着时间的推移，这些第一批移民的大多数定居下来，开始农耕和驯养动物。

2. in front of

在…前面

eg. Waiting her chance, the girl nipped in front of an old woman.

瞅准机会，那个女孩很快插在了老太太的前面。

eg. She spent hours in front of the mirror, combing through her long hair.

她在镜子前花费好几个钟头梳理她的长发。

3. covered with

覆盖着

eg. The rice seedlings were covered with plastic sheeting.

秧苗上面覆盖着塑料薄膜。

eg. The crystals are also covered with another layer of PDMS to protect them, and to safeguard the body since the crystals contain lead.

这些晶体上还覆盖有另外一层PDMS，用来保护它们；同时也保护人类的身体，因为这些晶体里含有铅。