With things like jams, the high sugar content means you don't have to store it in the fridge but it's wise to as they are prone to mould development over time.

像果酱这样含糖量高的，你不是必须要存放在冰箱里，但如果时间长了要发霉了最好还是冷藏吧。

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The Xiongan New Area will help solve problems in Beijing, like traffic jams and air pollution.

雄安新区将有助于解决北京的交通拥堵和空气污染等问题。

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But variables like pedestrians in crosswalks, large crowds and vehicle wrecks can throw a carefully designed system out of whack, leading to annoying and pollution-causing traffic jams.

但是，正在穿越人行横道的路人、摩肩接踵的人群以及道路上抛锚的事故车等不确定因素都可能让一套精心设计的系统崩溃失常，导致恼人而又产生污染的交通拥堵。

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Continental's short term goal is to relieve the driver of tedious and monotonous activities, such as driving on highways with minimal traffic or in low-speed situations like traffic jams.

ENGADGET: Continental gets automated vehicle approved for Nevada roads

Instead of indulging in heavy, ominous jams like their psychedelic predecessors, or stories and simple chord progressions, like other psych-folk bands, Citay has a more flowery, lighter and cohesive sound.

NPR: Citay: 'First Fantasy'

Ms. McNally said her book machine occasionally jams, much like a copy machine, but her staff has become adept at maintaining it, by vacuuming and cleaning it with alcohol, so disruptions have become infrequent.

WSJ: Brooklyn Library Gets On-Demand Printing