Gathering statistics on the scale of the problem is difficult.
按这个问题的规模来收集统计数据是有困难的。
The problem is difficult because BPA is used for most types of plastic foil in which you wrap food. Thus, a direct contact with the body is established and it occurs on a daily basis.
更困难的是，BPA是最常用在保鲜膜中的原料，人们每天都不可避免的会有直接接触。
The problem is difficult to understand.
这个问题难于理解。
The problem is difficult to solve in field of bellows designing.
该问题是波纹管设计的难点之一。
The problem is difficult to solve in field of bellows designing.
该问题是波纹管设计的难点之一。
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