但由于种种因素制约，煤层气勘探进展不大。
However, the exploration of coalbed gas so far makes little progress due to various factors.
当前我国的教育实习由于种种因素的影响而面临着重重的困境和阻碍。
Presently, China's educational practice is all due to the impact of such various factors, and faced with numerous difficulties and obstacles, which need to be resolved.
由于种种因素的影响，水彩人物画长久以来一直被视为最难表现的题材。
Because of the influence of seueral factors, the watercolor ang figure painting has long been considered as the most difficult subject to be reflected.
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