If you are not well acquainted with American or British culture, you may not understand some of the non-verbal behaviour and similarly your gestures may not be understood.

如果你不熟悉美国或英国文化，你会不理解一些非文字的表达，同样别人也不理解你的肢体语言。

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"The proposal to lower down payments is of particular concern given the greater default risk of these loans and the difficulty of setting prices for new products whose risks may not be well understood, " the report said.

FORBES: Nothing Down

The reasons for premature birth are not properly understood, but some of the factors which may be involved - such as poor diet and lifestyle - may themselves impact independently upon the health of the child.

BBC: Long-term risk of premature birth

"Don't waste time and money putting up these hoardings that may be understood only by elite 2% of the people, and that too not those who tend to walk on the streets too much, " resident Sanjiv Kapoor wrote on Calcutta traffic police's Facebook page.

BBC: Beatles' Abbey Road cover in Calcutta traffic campaign