A man should keep his friendship in constant repair. -samuel Johnson, British writer.
只有经常“浇灌”，友谊方能天长地久。—塞缪尔·约翰逊，英国作家。
Assertive teachers with a constant eye on these students can keep them in line.
凶一点的老师，只要使个眼神就能使他们归队。
A man should keep his friendship in constant repair.
只有经常“浇灌”，方能保持友谊天长地久。
How to keep constant temperature in production floor during winter time?
在冬季，车间里是如何做到温度的恒温的？
How to keep constant temperature in production floor during winter time?
在冬季，车间里是如何做到温度的恒温的？
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