外注式单体液压支柱推广使用中逐渐暴露出诸如重量重、污染环境等问题。
When DW single hydraulic props are widely used, problems, such as heavy weight, pollution and so on, appear.
边注：由于Rails迁移框架中存在某种限制，使清单2中的迁移无法使用外键。
On a side note: the migrations in Listing 2 unfortunately don't use foreign keys due to an unfortunate limitation in Rails' migration framework.
当你在选择大型的日间帆船（不用于过夜航行的——译者注），或一艘小型的远航帆船时，你可能会面临在配置舷内发动机或舷外发动机的帆船之间做出选择。
If you are looking for a large daysailer or a small cruising sailboat, you may be choosing between sailboats that have an inboard engine and those having an outboard motor.
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