It's hard to be sure, say those who study the matter, because many Japanese couples, when polled, describe their marriage as a love match even if it was arranged.

研究这一问题的人说，这很难确定，因为许多日本夫妇在接受调查时，称他们的婚姻是爱情的结合，即使是包办的婚姻。

youdao

It is hard to be sure.

这很难确定。

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They work hard to be sure that tall tree, glimmering waters, snow-capped mountains and fresh air are there to welcome you.

他们正在努力保护那些参天入云的大树，波光鳞鳞的湖水和白雪盖顶的山峦，以保证它们总能在那里欢迎你。

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Mr Greenspan argues that it is hard to be sure what constitutes a bubble.

ECONOMIST: The American economy

"It's hard to be sure, " he said, because the detailed inner workings of the Sun were a mystery.

BBC: Sun, Trace

It is hard to be sure whether this debate heralds a lasting shift in Canada's openness to immigration.

ECONOMIST: Immigration in Canada: A smaller welcome mat | The