乍看之下用英语怎么说？

乍看之下

例句

• Their spindly, delicate roots seem just plucked from the earth. 它们精致 、 细的根系乍看之下还以为是刚从土壤中摘出来的.
• It promised to be a more difficult undertaking than might appear at first sight... 那项任务可能比乍看之下还要困难。