To solve the equation means to move and change the terms about without making the equation untrue, until the root of the equation is obtained, which is the value of unknown term.

解方程时要进行一系列移项和同解变形，最后求出它的根，即未知量的值。

youdao

Although the long-term effects of this interaction on the moon are unknown, "this same process should be occurring on airless, silicate-rich bodies throughout the inner solar system," she says.

虽然月球上这种相互作用过程的长期效应并不显见，但是“相似的过程将在整个太阳系内部无空气、富含硅酸盐的天体上发生。”她这样说道。

youdao

This procedure may not be effective on large prostates. Its long-term effectiveness is unknown.

然而，这种方法在肿块较大时可能不是那么有效，并且其长期效果至今未知。

youdao

Scientific study has proved this drug generally useful for six months, but the long-term benefit is unknown.

CNN: Better understanding of dementia leading to more effective therapies

"Despite a considerable amount of research into the effects of legal highs, much is still unknown about their longer-term impact, " she said.

BBC: Summit discusses use of legal highs in Scotland

But he cautions that doctors need to "think twice, and even three times" before prescribing the drugs in kids, for whom the long-term efficacy, as well as the long-term risk, is unknown.

FORBES: Pharmaceuticals