They need a certain amount of weight in order to keep a tight grip on the rails.

它们本来就需要相当的重量来使自己紧紧咬合住铁轨。

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Fortunately, some well-staged action scenes and an emphatic performance from former television star Zo In-sung as a nice guy in a nasty line of work keep a Dirty Carnival on the rails.

幸运的是，精心设计的动作场面和明星赵寅成强有力的表演使本片取得了不俗的成绩。

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The concrete can be used to dust, damp sponge rails and grooves on clean with a dry sponge, once more, to keep clean seal.

具体可以先用干净的湿海绵拭擦滑轨、沟槽上的灰尘，再用干海绵擦拭多一次，以保持密封圈的清洁。

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So far, however, it lacks the heavy hitters such as former American presidents who might loosen the purse-strings and keep projects on the rails.

ECONOMIST: International aid

Outside intervention might yet keep the talks on the rails.

ECONOMIST: America at a loss

Two railway watchdogs, the Eisenbahnbundesamt (EBA) and the Bundesnetzagentur (BNetzA), try to keep DB on the rails, by checking how it manages such conflicts of interest as it allocates routes, sets timetables and schedules repairs.

ECONOMIST: German railways