The scientist's knowledge must be exact. There is no room for half right or right just half the time.

科学家的知识必须精确，决不能来个半对半错或时对时错。

youdao

We scored at the right moment just before half-time. 2-0 made a real difference because it's a lot harder to come back from.

我们在合适的时机进球了，半场结束就2-0领先。这很重要，因为要追回2球的劣势就很难了。

youdao

He managed to do just that shortly before half-time when Milner's delivery from the right found Barry who fed the ball into the six-yard for Carew to slam in.

BBC: Aston Villa 3-3 Everton