科研項(xiàng)目未完成時(shí)，可以使用以下英語表達(dá)：

– The project is not yet completed.
– The project has not been completed yet.
– The project is still in progress.
– The project has not been completed as expected.
– The project is facing some difficulties.
– The project has not been completed due to unforeseen circumstances.
– The project has not been completed on time.
– The project has not been completed as per the plan.

在這些表達(dá)中，“the project”是指正在進(jìn)行的科研項(xiàng)目，“not yet completed”是指項(xiàng)目尚未完成， “in progress”是指項(xiàng)目正在進(jìn)行， “un unforeseen circumstances”是指項(xiàng)目遇到一些不可預(yù)見的困難， “on time”是指項(xiàng)目按時(shí)完成， “as per the plan”是指項(xiàng)目按照計(jì)劃完成。