杂草丛生

to spring up───突然出现

dressing up───角色扮演；乔装打扮

feeding up───供给…食物；养壮

keeping up───保持；继续；不低落；不落后

measuring up───合格

messing up───陷入困境；搞糟

spring up───出现；涌现；萌芽

New fields of inquiry spring up like weeds, watered by papers that fall like rain: one group of researchers reckon that 1.3m articles were published in scientific journals in 2006 alone.───这项计划取得了惊人的反响。 约20，000个地方木森林组织遍布全国， 其2百万名成员每年春季花一个月的时间植树造林， 每砍伐一棵就再植一棵。

Some weeds spring up in only one night.