Scientists are becoming increasingly unsure of the validity of this technique.
科学家们越来越拿不准这一技术是否正当合法。
《柯林斯高阶英汉双解学习词典》
It's not certain they'll accept the Front's candidate if he wins.
即便来自阵线的候选人获胜,他们能否接受他还说不准。
《柯林斯高阶英汉双解学习词典》
No pedestrian crossing, must go straight through, not in the vehicle when approaching a crossing.
没有人行横道的, 须直行通过, 不准在车辆临近时突然横穿.
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In quantum mechanics an auxiliary integral is often introduced to prove uncertainty principle.
在量子力学中,为证明测不准关系式,常引入辅助积分.
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