Lower concentrations can damage engines without having an immediate effect on how well they work.
较低浓度的尘埃会损坏引擎,却不会当即彻底地影响其运行。
It may not have an immediate effect, but combined with rewarding good behaviour, tolerance, patience and realistic expectations, you'll see a change for the better over time.
但是如果你同时也奖励好的行为,做到宽容,有耐心以及对他们有合理的期望的话,时间一长,你就会看到孩子们好的转变。
Admittedly, not all these measures will produce an immediate effect.
无可否认,这些措施并非全部都会即时见效。
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