ещё хуже то, что
• To make matters worse [or To complicate (or aggravate) matters (or the situation)], the edges of both lens elements must be ground.
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Русско-английский научно-технический словарь
на Gufo.me
• To make matters worse [or To complicate (or aggravate) matters (or the situation)], the edges of both lens elements must be ground.