His suggestions were perfectly in line with the team's objectives.

in line 是一个固定短语，由介词 in 和名词 line 组成。 line 的本义是"线、线条"，引申为"路线、方向、标准"等含义。 in line 字面意思是"在一条线上"，引申为"一致、相符"的意思，表示两者在同一个方向或标准上。